They do free range a couple of hours each day. I’ll say 80% of what I give them is healthy, my husband on the other hand slips them French fries or some other bad food. But mostly I’m in charge of their food. I’m glad you pointed out the 10-15% of food intake. I didn’t really Pat attention and now I willIt depends what you eat. If you eat fish sticks and frozen pizza ...then I agree, but if you are eating healthy - then your compost bin is excellent variety of vitamins and nutrients for them. Fruits, veggies, berries, cooked meat scraps, soggy cereals, milk, brown rice, ends of your celery/ lettuce bottoms, dinner scraps. YUM!!! They will go nuts for it. Just keep it to 10-15% of their food intake. And of course, if you are not letting them free range, I'd recommend handfuls fo grass and dandelions each day. I guess my birds eat a large handful of weeds and grasses each, each day. I leave a mound for my roosters who do not get to free range( well, only on Mondays) and its always gone in an hour or less.