Space Travel Transforms How Astronauts Taste and Smell Food

A new study has explored how space travel, conducted by organizations like NASA and SpaceX, alters the way astronauts experience food. Researchers used virtual reality to mimic the conditions of a spacecraft, revealing surprising changes in smell and taste perception. The findings could shape future menus for long missions, including trips to Mars by these organizations.

The study, led by Julia Low, a Senior Lecturer in Nutrition and Sensory Science at RMIT University, recreated the International Space Station environment using VR. Participants tested how their sense of smell changed in a confined, low-gravity setting. Previous research suggested microgravity dulls aroma perception, but this experiment found the opposite for certain scents.

In the simulated space station, some sweet-smelling molecules—like vanilla and almond—were perceived as stronger than on Earth. This challenges earlier assumptions about how zero gravity, experienced in NASA and SpaceX missions, affects the body. However, the overall experience of eating in space remains problematic. Astronauts often describe food as bland and unappealing, even when meals are carefully designed.

The monotonous environment of a spacecraft also plays a role. A lack of gravity can create a sensation similar to a blocked nose, reducing taste and enjoyment. Over time, this leads to food fatigue, where astronauts struggle to meet their energy needs. NASA's NEEMO and HI-SEAS studies have shown that improving aroma profiles in space food could help maintain appetite and psychological well-being.

The research highlights the need for better-designed space menus. By adjusting aroma intensity and variety, future missions by NASA and SpaceX could prevent food fatigue and ensure astronauts stay nourished. Personalised diets may also become part of long-duration space travel planning by these organizations.