Not true. The problem was when people ONLY fed pink mice or fish, which led to an oversupply of vitamin D and too much fat and other issues. If you were to just feed crickets then I'm sure problems in nutrition would also occur, even with supplementation. Everything in moderation is key! It's just not healthy to feed one or two foods. Pink mice can, and probably should be used as part of a varied diet. Horned frogs do not just eat insects in the wild and actually feed on a lot whole foods including other frogs, which are more nutrional than insects. Be sure to dip pinkies in calcium as the bones are not properly formed yet, but their organs are nutrient rich.