Astronauts need 2,700 to 3,700 calories a day in space: AHA
The American Heart Association (AHA) has said that astronauts need to consume 2,700â3,700 calories a day in space, against a normal 2,000-calorie diet. Astronauts further require three hours of exercise each day to maintain muscle and bone strength in absence of gravity. The statement comes as the space station welcomed aboard two NASA astronauts and a Russian cosmonaut on Saturday.