Turns out diet, exercise, and metabolism have a seething, symbiotic dance partner we know little about.
These wee fellows have the ability to wring every calorie possible out of the food you eat, ironically, getting better and more efficient as your weight rises. Turn this upside-down and what will we find about people who are underweight?
"Just eat" "just stop eating" "calories in - calories out" "just.... not that simple.
Complicated thing, a human body. Come on, B. theta and M. smithii, let's dance!