Sunita Williams opens up on her health in space: What’s changing and why

A veteran of numerous space flights, Sunita Williams is currently a member of NASA's Starliner program at the International Space Station (ISS). Her fitness and health updates have gained attention from all over the world, especially after some recent photos sparked controversy about her appearance changes. Here's how her body responds to space.

Why astronauts look different in space

The fluid redistribution phenomenon is one of the most obvious changes astronauts experience. Body fluids are drawn downward by gravity on Earth, whereas they go towards the head and upper body in space. As a result, astronauts' features appear puffier and their heads appear broader. Although her "sunken cheeks" may seem concerning, Sunita Williams has pointed out that they are only a normal adaptation to microgravity.

Because the skeletal system and muscles behave differently in space than they do on Earth, her body is also changing in other ways, such as posture and muscle tone.

Weight loss rumors

Concerns regarding Sunita Williams' health have been sparked by recent images of her seeming thinner. In response, she stated, "I weigh the same as I did when I arrived at the ISS." Using specialist equipment, NASA weighs astronauts in orbit to make sure they are healthy. Williams informed everyone that her apparent weight loss was simply an optical illusion induced by fluid shift and muscle distribution alterations.

Muscle and bone density

One of the most difficult issues astronauts encounter is muscle and bone loss owing to the lack of gravitational pressure. To address this, Williams and her crewmates engage in rigorous fitness routines.


Williams stated that repeated squats and other weightlifting workouts have strengthened her thighs and glutes, which she credits with helping her maintain bone density.

Skin and eye changes

Long-term exposure to the space environment results in fewer evident health changes. In the confined atmosphere of the ISS, astronauts report experiencing skin sensitivity and irritation due to the growth of bacteria. Swelling around the eyes can impair eyesight. The medical staff at NASA is keeping a close eye on these impacts and regularly updates the crew on their health.


Not only is space living physically demanding, but it is also mentally taxing. Technical difficulties with their spacecraft recently forced Williams and her crewmate Barry Willmore to remain on the ISS for an extended period of time.