Here are some mind blowing facts, most likely you never heard about...
Let's begin pulling down the foundation of some healthy nutrition technics.
Question 1: How much meal do you eat during a day? In kgs.
The answer: 1 to 3 kgs.
Question 2: What else do you consume during a day?
The answer: Air.
Question 3: What is the weight of the air passing through your lungs during a day? In kgs.
The answer: From 10 kgs of air in a pretty quiet lying down state, to 24 kgs in a more or less active-vigorous state.
(For more info please google it) Pregnant women add upto 30-40 %.
Severe sportsmen - your figures come upto 35-40 kgs at heavy and long-term workouts.
Now let's compare weight of the «meal from a plate» and the air which we consume.
The divergence in kgs strikes:
24 kgs of air against 1 to 3 kg of donuts gets inside to be digested...
... Read more here: http://ecominded.net/articles/breathing-like-eating.html