I don't feed my tegus cat or dog food, only meats and fruits. I also feed my adult Argentine about 4-5 times per week, as much as she will eat. She's a good weight, 30" and 6 lbs. She was a rescue when I got her, full-grown and only 3 lbs. She has a nice, fat tail, but has a longitudinal wrinkle and not a fat, bloated belly. Here's a sample of her diet:

Mon: 1 rodent and cantaloupe
Tues: Quail chick and peeled apple
Thurs: Fish, chicken, insects, or worms, and mango or berries
Sat: ground turkey meatballs with vitamins or organ meats, and grapes

She's a bit picky since waking up and hasn't hit her full appetite yet.

My little Arg seems to only want to eat meat and I feed him just about every day.

My Colombian eats a variety of meats, three times per week.