What is the minimum number of calories a day needed to survive?

Answer 1

The amount and quality of food provided must satisfy daily

energy and protein requirements. A Survival Ration should provide

at least 2,100 kcal (and 60 g of protein) per person per day. This

is based on the Institute of Medicine's 1995 report on Estimated

Mean per Capita Energy Requirements for Planning Emergency

Rations. Active adults may require considerably higher energy

intakes, especially if part of the relief plan includes a Food-for-

Work Program. Although a marked difference exists between

the needs of a young child and an active adult, providing a

standard ration for each DP without distinction is strongly recommended.

Answer 2

None. You can survive without eating a single calorie during one day, assuming you have sufficientbody fat, glycogen or muscle. In the long run though you will need to consume energy. If you consume less energy than your body expends then you willeventuallydie.The energy needed varies from person to person. This can be calculated using specific formulas calculating BMR and then adding an activity factor which results in TDEE/TEE.