How much does an average human eat per day as percentage of their body weight?

Well, one calorie is equivalent to 7.71617917647 g. So to calculate the percentage of a persons body weight eaten, lets look at an average diet. A 19-30 year old male eats about 2600-2800 calories a day. We'll say 2700. This is equivalent to 349.914114 g, or about .35 kg. A normal 5' 9" male weighs around 155 lbs. or 70.3 kg. This means that the average male eats about .5 % of his body weight each day.