On average how much food does one human consume in a lifetime?

Answer 1

Lets see, assuming that we eat about 1 kg of food a day (since each gram of food is usually about 3 calories on average and we need perhaps 3000 calories this is a good number).

70 years*(365 days/1year)*(1 kg * 1 day) = 25550 kg or 25.5 metric tons.