Genetic engineering. Grown people are grooooooown.
Why would the Machines create a crop of people that introduced risk factors (obesity causes so many potentially fatal health problems) into the equation? It would be their most sincere desire to delete such variables.
In this reality Colonel Sanders was promoted to lead the Machines before he invented his finger licking recipies, hence the whole fast food industry never existed.
An in-shape, athletic human generates more energy than a sedentary, out of shape, obese one. It would be inefficient to have overweight people plugged in.
Correct but how many of those in-shape athletic humans are really in-shape or athletic? Obesity just like everything else inside the Matrix is just apart of the illusion. When it comes down to it Fat Albert is really a skinny bald shriveled up body laying inside a pod.
As to why all redpills seem to be buffed and not overweight well that may just come from the idea that all redpills are soldiers and are required to be in-shape. Speed and strength in the matrix may have nothing to do with the mussels but in the real world its all you have.
You don't see fat redpills because the real world food is so lousy that nobody overeats.
Illyria