Silkworms have 43% fat when crickets have 44% fat so they are actually healthier. Just still don't feed too many as it will result in watery urates and possibly diaherria from your lizard. Because of their high water content. They are also pretty high in calcium too ^^
Yes I agree feeding variety is best, but I do not agree that crickets are the healthiest feeder around, just in my opinion. Not because of what I said earlier, but because I believe dubias are better. They have a better meat to shell ratio, are higher in protein, and don't chew on your animal. But that's just my opinion. I was may have been wrong with the fat content, it's just what I have read before.
Too much protein can lead to serious problems.
I know too much animal protein can lead to gout