NASA has assured the world that the two astronauts stranded on the International Space Station for five months have enough food to eat. However, experts believe that their stock of fresh food is slowly depleting.

The astronauts have been feasting on pizza, roast chicken, and even shrimp cocktails but have very little fresh food in their diets, according to The New York Post report.

This comes amid the space agency closely monitoring the health of the two astronauts after recent photo showed Williams looking shocking weak and hollow-cheeked.

A specialist connected with the astronauts’ Starliner mission told The New York Post that the two have a variety of food, including breakfast cereal, powdered milk, pizza, shrimp cocktails, roast chicken, and tuna, and are consuming enough calories.

However, the diet is limited when it comes to fresh fruit and vegetables as it takes three months for the ISS to get a new supply of fresh food. “There’s fresh fruit at first but as the three months continues that goes away — and their fruits and vegetables are packaged or freeze-dried," they said.

NASA claimed that there is 1.7 kg of food per astronaut per day on the ISS which is personalised to meet each astronaut’s daily requirements. But all the food is cooked on earth and has to be reheated in space.

It insisted the astronauts are well-cared for. “So to be accurate, it should be very clear that any weight loss is not due to a lack of provisions on the ISS. There is plenty of food, even for an extended mission," they said.

The astronauts’ diets became global news after NASA released photos that showed Williams with sunken cheeks, appearing thinner. Williams denied the rumours and said that it was just her weight shifting due to the lack of gravity in space.