01:21 - Source: CNN
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If you’ve ever brought a favorite treat along to enjoy on a flight – a special chocolate bar, stacked-high sandwich, or flaky pastry, say – you might have noticed it didn’t taste as great at 30,000 feet.

It’s not just you.

Flying has a very real effect on the smell and taste of food and drinks for a number of reasons.

Herbert Stone, who has a PhD in nutrition, worked on food for the Apollo Moon Mission. He says that says chilly airplane temps are partly to blame. We don’t taste flavors as well when it’s cold.

Daisuke Tomita/The Yomiuri Shimbun/AP
Hamamatsu, Japan: Visitors come to Bentenjima Island from mid-November to mid-January, when the setting sun is framed by the torii gate, creating marvelous shots like this one. Click through the gallery for the rest of the best travel photos of 2018:
ILYA NAYMUSHIN/REUTERS
Krasnoyarsk, Russia: Deep in the Siberian winter, with air temperature at about -16 C (3 F), a man fishes on the banks of the Yenisei River.
Owen Humphreys/PA Images/Getty Images
Kirkjufell, Iceland: The aurora borealis, or northern lights, are seen over Kirkjufell, a 463-meter mountain on the west coast of Iceland.
NOEMI CASSANELLI/AFP/Getty Images
New Delhi, India: One of the largest mosques in India, Jama Masjid was commissioned by the Mughal emperor Shah Jahan and completed in 1656.
PATRICIA DE MELO MOREIRA/AFP/Getty Images
Lisbon, Portugal: A popular way to explore the Portuguese capital is to ride its distinctive yellow trams around the city's cobbled hills.
Peter Komka/MTI/EPA
Soshartyan, Hungary: As December temperatures fall below 0 Celsius (32 F), a church stands above a layer of fog in the Hungarian village of Soshartyan.
Xinhua News Agency/Getty Images
Linfen, China: The Hukou Waterfall scenic spot lies on the border between north China's Shanxi Province and northwest China's Shaanxi Province.
MOHAMED EL-SHAHED/AFP/Getty Images
Cairo, Egypt: The mosque of Ibn Tulun is the oldest mosques in the Egyptian capital of Cairo standing in its original form.
JAVIER ETXEZARRETA/EPA
San Sebastian, Spain: Dogs run free along Ondarreta Beach as a dramatic sunset takes over the December sky.
Matthias Balk/picture alliance/Getty Images
Munich, Germany: "Never Again," a work by artist Walter Kuhn to mark the 100th anniversary of the end of World War I, fills Munich's Königsplatz.
Chen Yang/SIPA Asia/Zuma Press
Xinjiang, China: Red peppers are aired following the fall harvest in northwest China's Xinjiang Province.
Aubrey Gemignani/NASA
Wallops Island, Virginia: An Antares rocket sets off from NASA's Wallops Flight Facility en route to the International Space Station, where it will deliver vital research materials, crew supplies and vehicle hardware.

Carlos Alonzo/AFP/Getty Images
Volcán de Fuego, Guatemala: Close to 4,000 people were evacuated from their homes in November when Guatemala's Fuego volcano erupted, spewing ash and lava.
Aidan Williams/Getty Images
Valley of the Gods, Utah: A team of international base jumping athletes rig a 503-meter slackline in Utah's spectacular Valley of the Gods.
Maja Hitij/Getty Images
Yerevan, Armenia: The Armenian Genocide Memorial complex, Tsitsernakaberd, was built in 1967 in the Armenian capital of Yerevan to commemorate the approximately 1.5 million Armenians killed in the Ottoman Empire between 1914 and 1923.
Amal KS/Hindustan Times/Getty Images
New Delhi: The Lotus Temple, made up of 27 free-standing marble-clad "petals," is a Bahá'í House of Worship and one of India's most popular sights.
Kazi Salahuddin Razu/NurPhoto/Getty Images
Dhaka, Bangladesh: In Bangladesh, Hindu devotees sit together on a temple floor to observe Rakher Upobash celebrations.
Kyodo News/Getty Images
Uji, Japan: Byodoin Temple, built in the 10th century, is a Buddhist place of worship and a UNESCO World Heritage site.
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Paris: The Louvre is the world's largest art museum and is home to around 38,000 exhibits. It receives more than eight million visitors a year.
Dan Kitwood/Getty Images
Amberley, United Kingdom: An enchanting mist fills lower-lying areas in South Downs National Park, which is in West Sussex near Amberly, England, in early October.
Carl Court/Getty Images
Katsuta, Japan: Visitors wander through a field of bright red kochias (summer cypress) at Hitachi Seaside Park in Katsuta, east of Tokyo. In early to mid-October, these kochias turn from green to red and become a photographer's paradise.
Christoph Schmidt/DPA/Zuma Press
Stuttgart, Germany: Revelers ride a chain carousel at the 173rd Cannstatter Volksfest, a three-week long beer festival and fair. Stuttgart is in southwestern Germany, about a two-hour drive from the French border.
Jens Kalaene/DPA/ZUMA Press
Zakynthos, Greece: The Blue Caves in the Bay of Skinari on the Greek island of Zakynthos in the Ionian Sea are one of the island's top tourist attractions. The water's incredible color comes from special light reflections.
Claudio Furlan/LaPresse/ZUMA Press
Milan, Italy: This striking image is taken at the "Inside Magritte" multimedia path at the Fabbrica del Vapore (Steam Factory), an arts center in this northern Italian city.
Fabrice Coffrini/AFP/Getty Images
Arolla, Switzerland: In mid-October in Arolla, western Switzerland, visitors throw stones in the "Blue Lake." Algae and glacial clays colors the water this vivid blue.
Tony Anna Mingardi/Awakening/Getty Images
Trieste, Italy: At the 50th Barcolana regatta in Trieste, Italy, boats sail past the Victory Lighthouse. This historic regatta is held annually on the second Sunday of October.
Xinhua/ZUMA Press
Weng'an, China: This aerial shot depicts kayaks moored on the Jiangjie River in Weng'an County, which is in southwest China's Guizhou Province.
Robin Utrecht/Sipa USA
Rotterdam, the Netherlands: This is the Cube House in Rotterdam -- 38 cube-shaped pile dwellings and 13 business cubes. The Cube House was designed by architect Piet Blom.
PA Images/Sipa USA
\North Tyneside, United Kingdom: A surfer heads toward the North Sea at sunrise in North Tyneside in northern England.
Maja Hitij/Getty Images
Seljalandsfoss, Iceland: Iceland's Seljalandsfoss waterfall features a 60-meter drop (197 feet) and is part of the Seljalands River. Visitors here are able to walk behind the falls and explore the cave behind.
Diego Azubel/EPA/REX/Shutterstock
Phimai, Thailand: One of the largest Khmer temples in Thailand, the centerpiece of Phimai Historical Park is the restored ruins of the Prasat Phimai sanctuary.
Cristobal Saavedra Escobar/Reuters
Pucón, Chile: Villarrica -- seen here from the town of Pucón -- is one of Chile's most active volcanoes. Its last major eruption was in 2015.
Xinhua/Sipa USA
New York City: The "Tribute in Light" is an art installation lit annually in New York on September 11. Searchlights are used to create two vertical columns of light representing the Twin Towers.
Sergei Ilnitsky/EPA/REX/Shutterstock
Moscow: Zaryadye Park opened near the Kremlin in September 2017. One of its highlights is the 70-meter "floating bridge" designed by Diller Scofidio + Renfro, the architectural studio behind New York's High Line Park.
Dean Treml/Red Bull/Getty Images
Polignano a Mare, Italy: The town of Polignano a Mare, in southern Italy on the Adriatic coast, played host in September to the Red Bull Cliff Diving World Series.
Denis Balibouse/Reuters
Valais, Switzerland: There's a 100-meter ice tunnel and ice chamber inside Switzerland's Rhone Glacier. It's cut fresh each year and the season runs from June to October.
Tiziana Fabi/AFP/Getty Images
Rome: What's more spectacular than St Peter's Basilica? Two St Peter's Basilicas. Photographer Tiziana Fabi caught this reflection in a puddle in September.
Li Jianxin/Xinhua/ZUMA Press
Hunan province, China: This aerial shot shows a farmer raking rice crops for air-drying. This year, China marked its first Farmers' Harvest Festival on September 23.
Serebryakov Dmitry/TASS/ZUMA Press
Moscow: This aerial views shows the unusually shaped building at 13 Nezhinskaya Street, a circular house in Moscow's Ochakovo-Matveyevskoye District.
Anthony Devlin/Getty Images
Manchester, England: "Waves," part of Paul Cummins and Tom Piper's art installation "Poppies: Blood Swept Lands and Seas of Red," went on display in Manchester's Imperial War Museum North in September.
Gerard Julien/AFP/Getty Images
Marseille, France: In southern France, an aerial foot-bridge links the 17th-century Fort Saint Jean with the Museum of European and Mediterranean Civilisations (pictured).
Tracy Barbutes/ZUMA Press
Reno, Nevada: The 37th Great Reno Balloon Race took place this year from September 7 to 9. More than 100 hot air balloons took to the sky in this annual event.
Andrew Mccaren/London News Pictures/Zuma Press
Cley next the Sea, England: The 18th-century Cley Windmill is lit dramatically at sunrise on the Norfolk coast in England's East Anglia.
Charles Platiau/Reuters
Paris: In September, designers Motoko Ishii and Akari-Lisa Ishii presented a two-day light show on the Eiffel Tower to celebrate the Japanese cultural season and 160 years of diplomatic relations between France and Japan.
Jana Bauch/DPA/ZUMA Press
Düsseldorf, Germany: Tomás Saraceno's art installation "in orbit" is on permanent display at the K21 Standehaus art museum.
Johannes Eisele/AFP/Getty Images
Guangzhou, China: Sometimes known as the "Notre Dame of East Asia," Guangzhou's Sacred Heart Cathedral is a Gothic Revival building completed in the 19th century.
Danish Siddiqui/Reuters
Pyongyang, North Korea: The 170-meter Juche Tower -- named after the Juche ideology introduced by Kim Il-sung, first Supreme Leader of North Korea -- rises above the Pyongyang skyline.
Frank Molter/DPA/ZUMA Press
Hasenmoor, Germany: A festival atmosphere overtook Hartenholm airfield from August 30 to September 2, as crowds gathered for a new edition of the legendary Porsche vs. customized motorcycle "Werner Race."
Sipa USA
Beijing: The 24-hour bookstore Page One, located in front of Zhengyang Gate, is beautiful inside and out. It has a stunning architectural interior plus great views over the city.
Eugene Hoshiko/AP
Yokohama, Japan: A man rides a public electric bike through the port city of Yokohama, Japan's second-largest city.
TIMOTHY A. CLARY/AFP/Getty Images
New York City, New York: The elevated glass walkways at Grand Central Terminal in Midtown Manhattan aren't open to the general public, but employees use them to get between connecting offices.
GENT SHKULLAKU/AFP/Getty Images
Durrës, Albania: Parasols dot a beach in the port city of Durrës on the Adriatic Sea. Beach-goers made the most of the summer heatwave sweeping Europe and beyond.
Wang HE/Getty Images
Manzhouli, China: Situated on the border with Russia and very close Mongolia, the frontier town of Manzhouli is home to a 215-acre amusement park with a Russian Doll theme.

HA TIEN ANH/EPA
Ba Na Hills, Vietnam: The 150-meter-long Golden Bridge rises above Trường Sơn Mountains. It's supported by a pair of giant hands which may look weathered, but the bridge opened only in June 2018.
Giannis Alexopoulos/NurPhoto/ZUMA Press
Athens, Greece: A giant statue of Oedipus is featured in the performance of Sophocles' "Oedipus at Colonus." It's part of the 2018 Athens and Epidaurus Festival, held this year in August.
Dmitri Lovetsky/AP
Kalyazin, Russia: Kalyazin Bell Tower is all that can be seen of the submerged monastery of St. Nicholas, which was lost underwater after the creation of the Uglich Reservoir along the Volga River at the end of the 1930s.
Craig Hudson/Charleston Gazette-Mail/AP
Fairlea, West Virginia: Pictured on its opening day, August 9, the 2018 State Fair of West Virginia was held in the town of Fairlea.
DARRYL DYCK/The Canadian Press/AP
Richmond, British Columbia: Children float inside inflatable water walking balls in a pool at the Richmond Night Market in the Canadian city of Richmond in August.
Xinhua/Sipa USA
Manila: Visitors look at jellyfish inside the Manila Ocean Park in the Philippines capital.
RODRIGO BUENDIA/AFP/Getty Images
Quito, Ecuador: French artist Laurent Langlois' work "Heritage" is projected on to the San Francisco church in the historical center of Quito ahead of the town's Festival of Light, which took place this year from August 8 to 12.
Vickie Flores/London News Pictures/ZUMA Press
London: In the East London neighborhood of Shoreditch, a new mural by artist Jules Muck, in collaboration with Global Street Art, pays tribute to the late musician Aretha Franklin.
Wolfgang Rattay/REUTERS/Newscom
Haltern, Germany: An aerial view of a beach on the shores of Lake Silbersee shows beach-goers enjoying the early August heatwave.
ERDEM SAHIN/EPA/REX/Shutterstock
Antalya, Turkey: Hand-knotted carpets are spread out in the sunshine in order to soften the color of their dyes.
Emrah Gurel/AP
Cappadocia, Turkey: Hot-air balloons rise into the sky at sunset, allowing tourists stunning views of cone-shaped rock formations and rippled ravines.
Yang Bo/China News Service/VCG/Getty Images
Nanjing, China: China's eastern city of Nanjing is known for history, temples and ancient architecture. But when the thermometer rises, its water parks are a popular place to cool off.
Vishal Bhatnagar/NurPhoto/Zuma Press
Manali, Himachal Pradesh, India: A country of incredible sights during the day, India also has some dazzling sights at night. This view of the Milky Way was taken in the north Indian state of Himachal Pradesh.
DESIREE MARTIN/AFP/Getty Images
Puerto de la Cruz, Tenerife, Spain: This drone image shows the Virgen del Carmen festival that honors the patron saint of fishermen on the Spanish island of Tenerife. Local residents take a statue of the Virgen del Carmen on board an adorned boat and sail it along the coast.
Mohammad Abu Ghosh/Xinhua/Zuma Press
Amman, Jordan: The Citadel archaeological site, in downtown Amman, is illuminated red to celebrate the 50th anniversary of the Special Olympics.
Li Jianxin/Xinhua/Zuma Press
Yongfeng, Shuangfeng County, China: The Hunan region of China is home to some of the country's spiciest dishes. Here, the region's red peppers are being laid out to dry for use by a Chinese chili sauce manufacturer.
PATRICIA DE MELO MOREIRA/AFP/Getty Images
Alfama, Lisbon, Portugal: At a time when concerns about the negative effects of tourism are rising, some destinations are taking steps to protect their identity and residents. Lisbon is presenting keys to several apartments in the city's historic districts to citizens whose apartments came under threat because landlords want use the homes for tourism purposes.
Zhang Wenkui/SIPA/Zuma Press
Shenyang, China: Another city of imperial treasures, Shenyang, in northeast China's Liaoning Province, also has some eye-catching modern installations, such as these air conditioners spotted on the wall of a brightly decorated building.
Zhou Haijun/Xinhua/Zuma Press
Lugou Village, Xuyi County, Huai'an City, China: Shanghai might be China's most ultramodern city, but outside the city, traditional farming methods persist. In Jiangsu Province to the north, a farmer collects lotus seedpods.
Xue Jun/Xinhua/Zuma Press
Yungcheng City, China: An abstract-looking, multicolored Salt Lake is spotted over Yuncheng in China's Shanxi Province, west of Beijing. The lake changes color as water density fluctuates.
Rob Pinney/London News Pictures/Zuma Press
London, UK: As a heatwave hits the UK capital, a woman rows past the London Mastaba, a floating sculpture created by Romanian artist Christo in the Serpentine lake in Hyde Park.
Xu Congjun/SIPA/Zuma Press
Nantong, China: Technicolor flowers are pictured in bloom at a green expo garden in east China's Jiangsu Province, north of Shanghai.
USGS/Cal Sport Media/Zuma Press
Hawaii: This eye-catching shot shows a drone hovering over an active lava channel to monitor data and any changes. Hawaii's Kilauea volcano erupted in early May, creating havoc on the island. Lava from the eruption at one point created a new island.
JOSE SENA GOULAO/LUSA/EPA
Lisbon, Portugal: Catalan Company La Fura Dels Baus make incredible shapes at the Super Bock Super Rock Festival in Lisbon.
Shuji Kajiyama/AP
Tokyo: A new museum specializing in digital art opened in Tokyo in June. TeamLab's installation "Forest of Resonating Lamps" is pictured in the new venue, called MORI Building DIGITAL ART MUSEUM teamLab Borderless.
Michael Probst/AP
Podolsk, Russia: Russia produced plenty of spectacular moments in June as it hosted the World Cup, including this dramatic sunset in Podolsk, near Moscow.
Bruno Kelly/Reuters/Newscom
Rio de Janeiro, Brazil: Residents of Rocinha, Rio's largest favela, play on the street following the Brazil vs Switzerland World Cup match on June 17.
Manish Swarup/AP
Dehradun, India: Mats are laid out in the Uttarakhand capital ahead of International Day of Yoga on June 21.
Nicolas Economou/NurPhoto/Getty Images
Chania, Crete: A few kilometers from the city of Chania on the Greek island of Crete, Stavros Beach was the filming location for the celebrated dance scene in the 1964 film "Zorba the Greek."
VANO SHLAMOV/AFP/Getty Images
Tbilisi, Georgia: A drone captured this image of the Georgian capital's futuristic Rhike Park theater and exhibition hall (center), and the ultraclassical Presidential Palace (pictured behind).

Yonhap News/Newscom
Jeju, South Korea: For an unrestricted view of the sea life that populates the aquamarine waters off South Korea's Jeju island, rent a kayak with a transparent bottom.
Tarek Mustafa/Alamy
Samarkand, Uzbekistan: The three medressas in Registan plaza in northeast Uzbekistan were built between the 15th and 17th centuries and are among the world's oldest educational institutions of their kind.
Bobylev Sergei/TASS/Zuma Press
Moscow: Russians celebrate Victory Day on Moscow's Poklonnaya Hill on May 9. Poklonnaya Hill is one of the highest points in the city.
Danil Shamkin/NurPhoto/Getty Images
Cefalu, Sicily: The mountain of La Rocca, which rises above Cefalu, is scalable in around an hour (if the going's good).
Xinhua/Mou Yu/Getty Images
Laoting County, China: Tourists explore an ecological landscape area in Laoting County in north China's Hebei Province.
Zuma Press/Newscom
Istanbul: The Süleymaniye Mosque, completed in 1558, rises over the Golden Horn estuary, which is bustling with boats on an evening in May.
FRANCK FIFE/AFP/Getty Images
Merzouga, Morocco: Titan Desert 2018 was a 600-kilometer, six-day mountain bike race between the towns of Boumalne Dades, in the High Atlas, and the Saharan desert oasis town of Erfoud. Stage 5 took place around Merzouga.
Artur Widak/NurPhoto/Getty Images
Cabo Girao, Portugal: At 580 meters (1,900 feet) Cabo Girao is the highest promontory in Europe. Situated on the Madeira archipelago, it offers spectacular views over the North Atlantic.
Michal Fludra/NurPhoto/Getty Images
Zamosc, Poland: The Renaissance town of Zamosc, with its Great Market Square and impressive 17th-century Town Hall (pictured left), is one of southeast Poland's premier attractions.
Darryl Dyck/The Canadian Press/AP
Mission, Canada: An aerial view of a plant nursery near Mission, British Columbia. About 80 kilometers southeast of Vancouver, the town's chief industries have traditionally been forestry and agriculture.
Waseem Andrabi/Hindustan Times/Getty Images
Srinagar, Kashmir: Dubbed the "jewel in the crown of Kashmir," Dal Lake is one of the chief attractions in Srinagar, the summer capital of Jammu and Kashmir.
MARK RALSTON/AFP/Getty Images
Arches National Park, Utah: There are more than 2,000 arches in Utah's Arches National Park. Its other celebrated rock formations include the Courthouse Towers (pictured), a group of tall stone columns.
Simone Padovani/Awakening/Getty Images
Venice, Italy: A visitor looks at work by Denmark's Dorte Mandrup architectural firm ahead of the May 26 opening of the 16th International Architecture Biennale in Venice.
Vladimir Astapkovich/Sputnik/AP
Sintra, Portugal: The gaily painted Pena Palace sits high in the Sintra Mountains and is one of several colorful 19th-century monuments in the town of Sintra, around 30 kilometers from Lisbon.
Christopher Furlong/Getty Images
Leamington Spa, UK: Overlooking the English village of Chesterton, Chesterton Windmill was built in the early 17th century and is one of Warwickshire's most famous landmarks.
MARCO BERTORELLO/AFP/Getty Images
Florence, Italy: Construction on Palazzo Vecchio, Florence's town hall, began back in 1299. It's built on top of Roman ruins dating back to the first century CE (which can be viewed during a tour of the building).
Soe Zeya Tun/Reuters/Newscom
Ko Panyi, Thailand: The floating fishing village of Ko Panyi, in Phang Nga Province, was built on stilts by Indonesian fishermen. Here, a woman selling souvenirs and trinkets awaits customers in her shop.
Yang Wenbin/XinHua
Zunyi, China: Children take part in a springtime tea-picking tour of Meitan County in China's Guizhou Province.
Jérémie Fulleringer/Maxppp/Zuma Press
Lofoten, Norway: The aurora borealis is pictured over Norway's Lofoten archipelago in February 2018.
Nicolas Economou/NurPhoto/Getty Images
Bruges, Belgium: Sometimes called "The Venice of the North," the West Flanders capital is celebrated for its many canals and UNESCO-protected historic center.
Eugene Hoshiko/AP
Sasebo, Japan: Azaleas are pictured in their full April bloom at Nagushiyama Park in Nagasaki Prefecture, southwest Japan.
Leisa Tyler/LightRocket/Getty Images
Malacca City, Malaysia: Jonker Street, in the Malaysian city of Malacca, is famous for its night market on Fridays and Saturdays.
Zhou Haijun/XinHua
Xinghua, China: Captured on an April day, tourist boats sail among banks of brassica flowers in east China's Jiangsu Province.
Ahn Young-joon/AP
Seoul, South Korea: Lanterns at Jogyesa Temple are adjusted as part of preparations for the celebration of Buddha's birthday on May 22.
Xu Yu/XinHua
Wuzhen, China: In the town of Wuzhen in Tongxiang, Zhejiang Province, a boat procession is held on April 1 to celebrate Cansheng, the patron god of silkworms.
Romy Arroyo Fernandez/NurPhoto/Getty Images
Maastricht, Netherlands: Mount Saint Peter, on Caestert Plateau, is the end point of the 490-kilometer Pieterpad walking route that runs from the north to the south of the country.
Yuli Seperi/Barcroft Media/Getty Images
Tanjung Pinang, Indonesia: A former fisherman's district in Tanjungpinang has been decorated with murals and colorful umbrellas to turn it in the rainbow Malay village tourist destination.
Chesnot/Getty Images
Paris: The Ferris wheel in Tuileries Garden offers spectacular views over the French capital, including the Louvre, one of the world's most-visited museums.
FAYEZ NURELDINE/AFP/Getty Images
Al-Ula, Saudi Arabia: Following a landmark agreement with France, the ancient city of Al-Ula, renowned for its archaeological treasures, is set for touristic and cultural development.
Pramod Thakur/Hindustan Times/Getty Images
Mumbai, India: A group of tourists forms a human pyramid at sunset on Mumbai's Juhu Beach on March 25, as the city recorded one of its hottest March days ever, with temperatures rising to 41 C (106 F).
MANDEL NGAN/AFP/Getty Images
Washington, D.C.: In March, visitors gather outside The Lincoln Memorial in the US capital as the fourth nor'easter in less than three weeks hits the East Coast, bringing heavy snow and winds.
Visual China Group/Getty Images
Xinjiang, China: On a cold February day during the Spring Festival holiday in northwest China's Xinjiang Uygur Autonomous Region, herdsmen patrol the border to ensure maximum security. Xinjiang borders eight countries -- Mongolia, Russia, Kazakhstan, Kyrgyzstan, Tajikistan, Afghanistan, India and Pakistan.
Carl Court/Getty Images
Tokyo, Japan: In this March image, cherry blossom is seen hanging over the Meguro River, one of the best cherry blossom viewing spots in Tokyo, located in the Nakameguro area. The flowers only bloom for around a week, marking the start of spring, before they begin to float off the trees.
Gil Cohen Magen/Xinhua/Sipa
Neve Zohar, Israel: Tourists pose for pictures on an embankment between evaporation ponds -- used to remove salt from the water -- in the southern part of the Dead Sea in community settlement Neve Zohar.
Ahn Young-joon/AP
Seoul: Revelers celebrate in the South Korean capital as celebrations kick off to commemorate the first full moon of the Lunar New Year, which falls on March 2 in 2018.
Rebecca Blackwell/AP
La Concepción, Mexico: A boat glides across the Papagayo River downstream from La Concepción, one of various small communities in the region near Acapulco that have been divided by federal plans for a vast hydroelectric project. The rift has led to clashes between villagers.
Visual China Group/Getty Images
Longyan, China: From February, this aerial shot shows cherry trees in bloom at a tea plantation in Yongfu Town in Longyan, Fujian.
Sam McNeil/AP
Dhofar, Oman: In February, the desolate conditions of southern Oman's Dhofar desert were judged ideal for field-testing technology for a manned mission to Mars by members of the Austrian Space Forum.
Frank Augstein/AP
London, UK: Kew Gardens worker Jenny Forgie adjusts a display ahead of the celebrated gardens' annual Orchid Festival, which in 2018 runs from February 10 to March 11.
Lars Hagberg/The Canadian Press/AP
Ontario, Canada: On a February morning, mist rises over the frozen Cataraqui River in Kingston, Ontario.
Afrianto Silalahi/Barcroft Media/Getty Images
Pekanbaru, Indonesia: This year Lunar New Year celebrations began around the world on February 16. Festivities in Pekanbaru's Chinatown are pictured.
Carl Court/Getty Images
Seoul: With the PyeongChang Olympic Winter Games in full swing and the world's eyes on South Korea, tourists wearing traditional Korean hanbok dresses visit Seoul's Gyeongbokgung Palace.
Oliver Berg/dpa/Picture Alliance/Newscom
Cologne, Germany: Completed in 2017, the Cologne Central Mosque was designed by German architect Paul Böhm. An interior view of the praying room's dome is pictured.
Henry Romero/Reuters/Newscom
Lima: Peru has a long and enviable coastline and its capital, Lima, sits right in the center. This aerial shot shows a couple enjoying the sands on a January day.
Emilio Morenatti/AP
Vilanova de Sau, Catalonia, Spain: The eerie remains of an ancient village are seen inside the reservoir of Sau, in Vilanova de Sau, Catalonia, Spain. The reservoir usually covers this 11th-century Romanesque church -- but in January the waters were so low that the building was uncovered.
Narayan Maharjan/NurPhoto/Getty Images
Boudhanath Stupa, Kathmandu, Nepal: Pigeons fly above the UNESCO heritage site of Boudhanath Stupa, in Kathmandu, Nepal.
Omar Marques/Anadolu Agency/Getty Images
Zakopane, Poland: This drone photograph depicts visitors exploring the biggest snow maze in the world in Zakopane, Poland.
Yu Kun/China News Service/VCG/Getty Images
Ice and Snow World, Harbin, Heilongjiang Province, China: Visitors admire stunning, illuminated ice sculptures in the Ice and Snow World section of the 34th Harbin International Ice and Snow Sculpture Festival.
OZAN KOSE/AFP/Getty Images
Blue Mosque, Istanbul, Turkey: A tourist takes a snapshot of Istanbul's Blue Mosque, also known as Sultanahmet.
Alessandro Bosio/Pacific Press/Sipa
Lake Orta, Italy: The sun setting over Isola San Giulio (St Julius island) on Lake Orta in northern Italy.

Remember too, that taste and smell are inextricably combined, so what affects your sense of smell impacts tastes big-time.

Pressurized cabins lower blood oxygen levels, and that reduces the ability of olfactory receptors. And the constantly circulating, super-dry air of the airplane cabin—an average 12 percent humidity, lower than that of the Sahara Desert—directly affects the nose.

“Low moisture and air movement will dry the nasal passages and this reduces odor and taste sensitivity,” says Stone, who adds that when the exact same food is tested at sea level, “it will be rated as stronger and more intense.”

Then there’s the noise—the drone of the airplane’s engines, the baby screeching in the back row—also affects how food tastes.

Additional research has shown that no matter the environment, flavor perception is dampened by loud background sounds.

A guerrilla approach to flying with kids

Some tastes are affected by these factors more than others.

“Salt is perceived to be between 20 and 30 percent less intense and sugar 15 to 20 percent less intense, at high altitude, according to research by the Fraunhofer Institute for Building Physics that was conducted for Lufthansa. The perception of fruity aromas and acids is by contrast more stable,” according to research by the Fraunhofer team.

And this might be a conservative estimate: “In the air you lose almost 70 percent of your sense of taste,” says Antonio Fernandez, AeroMexico’s senior vice president for on-board product.

Considering all of these factors, it’s not a big surprise that the salted caramel macaron that explodes your taste buds with flavor on the ground tastes like a ghost of itself in the air.

But savvy airline chefs know that some flavors do better than others in the sky: Spicy and intense flavors remain pretty stable at altitude—like a Thai or Korean curry, and so does fresh fruit, especially citrus. Umami flavors–like those found in mushrooms, seaweed, hard cheeses and meat–lend richness and depth to dishes, and they come through well, too.

Scents on a plane: Why the aviation industry is waking up to fragrance

“Flavors such as cardamom, cinnamon, ginger, parmesan, tomato, mushrooms, soy, meat and lentils” are the go-to flavor-enhancers for Aeromexico’s chefs, says Fernandez.

Cuisine that relies on subtle flavors (like how fish, pasta or poultry might normally be prepared) end up the big flavor losers and lead to complaints, food scientists have found. “Typical reactions include words like ‘tasteless’ and ‘cardboard’,” says Stone.

On top of all the taste-perception challenges, food prep areas aren’t exactly restaurant-quality at 30,000 feet. Flight attendants aren’t sous chefs, and space is at a premium. There’s only one oven and an entire entree must be cooked at the same temperature for the same amount of time.

“I actually liked the challenge that this proposed because it allowed me to get creative on how to keep some things crunchy, some soft, and all hot and delicious,” says Brad Farmerie, the Executive Chef at New York City’s Saxon + Parole. He developed the menu for Mint, JetBlue’s premium class of service.

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Tips for eating healthily on the road: Airplane food is fine -- just try to keep to your normal eating schedule.
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At breakfast, stay away from processed meat. Choose eggs, mushrooms, tomatoes, baked beans and salmon instead.
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Avoid sugar-sweetened breakfast cereal and bear in mind that not all granolas are healthy. Try porridge, wholegrain wheat cereals or fruit with plain yogurt.
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It's best to avoid all-you-can-eat hotel buffets, but when resistance fails, the answer is to only go up once. A smaller plate helps, as does some color with fruit and veg.
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It's very tempting to pick up something "quick and easy" when on the run. The allure of fast food is best avoided.
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Deep-fried, fried, crispy, battered, and cream-rich items should be off limits.
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Healthy alternatives to fast food are the answer. This means seeking out dishes that are grilled, chargrilled, poached, stir fried, steamed, cooked in their own juice, or in a tomato-based sauce.
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Instead of filling plate (and stomach) with bread, it's best to go with extra vegetables.
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Food isn't always the best reward. Travelers should treat themselves instead to a spa session, massage or another pick-me-up.

He said getting a soft-boiled egg for brunch items or being able to offer a medium-rare burger was a challenge that took some time to successfully crack.

Some airline chefs will just ramp up sugar and salt to make up for lost flavors and less-than-ideal cooking circumstances. “This just adds to the dehydration that travelers feel during and after the flight,” Farmerie says.

When he developed a menu for the airline, “I knew that I needed to incorporate acidity, heat and umami to make up for the muted sense of smell and taste. These elements give the cuisine a ‘lift’ and brighten the natural flavors of the dish without the need for more salt,” he adds.

Why do we cry on airplanes?

Farmerie cites the airline’s popular carrot and ginger soup with chili marshmallow as one that ticks all the boxes: It combines fresh carrot flavor with white miso for umami, lemon juice for acidity, and ginger and chili for sweet spice, all of which provide flavor without extra salt or sweetener.

Whether you order on board, buy food at the airport, or bring your meal from home, keep in mind that simple, healthy foods are what most chefs who are frequent fliers choose: Fruit and cheese plates (err on the side of harder cheese when it comes to security restrictions); Asian stir-fries; and vegetable soups like carrot or tomato.

And maybe throw one of those travel-size bottles of hot sauce into your carry-on bag.

Starre Vartan’s first travel memory is of the Penglipuran ruins in Bali where she sojourned with her parents as a toddler; she’s been to 29 countries since.