There is nothing healthier about non-GMO, organic or cage-free foods.  GMO foods have more nutrients than non-GMO foods.  Organic foods have more pesticides than non-organic foods.  Cage free doesn't make a difference if the animal's diet doesn't change.  Grass fed is arguably healthier, maybe more Omega-3's and stuff. Eating a diet that has a variety of vegetables, legumes, fruit, and whole grains along with a variety of cuts and types of unprocessed meat is healthy and will help anyone lose weight.  Even if the fattest hamplanet stuffed themselves all day with leafy greens, the calorie density is so low that they wouldn't be able to maintain their weight.