Catabolic foods are those foods which actually contain fewer calories than it takes to consume them.
For example an egg is 70 calories, but when the egg is hard boiled the human body burns more than 70 calories to digest that hard boiled egg. (Mind you, chewing is part of the calorie burning too -- no swallowing whole.)
I recently, happily, discovered that there are bunches of foods that are "net negative" or at least "net neutral" in their calorie content. I thought I'd share my list.
Fruit: (fresh, raw, and preferably organic)
Veggies: (raw or lightly steamed, and plain)
Protein: (clean, homegrown, and poached)