What is the most nessecery group of food that the human body requires in order to stay alive?

Question: What is the most nessecery group of food that the human body requires in order to stay alive?
- Keywords:
  alive,
  body,
  food,
  group,
  human,
  nessecery
Asked by jewlz to Mike, Pip, Tianfu, Tim, Tom on 29 Jun 2012.
- Tim Stephens answered on 29 Jun 2012:
  
  Not my area of expertise – I think that you really need all the food groups: Fat, Sugars, Vitamins, Protein, Carbohydrate, Salts. Your body uses each to do something important, and with only one type of food, you’d miss vital nutrients and would get sick.
- Tom Lister answered on 30 Jun 2012:
  
  I completely agree.
  
  I heard recently that a famous group of Antarctic explorers starved to death because they didn’t bring enough fatty food with them, they were just on a high protein diet (like an Atkins diet). So they starved, even though they had food left over.

Question: What is the most nessecery group of food that the human body requires in order to stay alive?