Where can I find best diet affiliate products?

Okay, let's be realistic here.

Best as in what?

1. Best converting?

Or

2. Best product that actually works?

If it's 2, forget it. There is no way to know for certain, unless you try it or
know somebody who has personally tried it, if the product is good or not.
So any recommendations here, unless they are personal use recommendations,
need to be taken with a grain of salt.

If it's 1, then my suggestion is to go to the Clickbank marketplace and
see which products have the highest gravities. No, this is not a full proof
way to find out because gravity can be manipulated and even if it's not,
gives no indication to conversion rates.

In short, nobody can really answer your question in either case. The only
thing you can do is the following:

1. Pick out a product...any product.

2. Check the sales page. See if it's well written.

3. See if there are testimonials that appear believable.

4. Check online to see if users have reviewed it favorably.

I recently found a product in the health niche that I actually tried
myself because of the rave reviews and it actually DOES work. In fact,
while I am not yet promoting it as an affiliate, I am seriously considering
doing so because it's so good.

Ultimately, THAT is the best way to determine what a good product is.

Anything else is just shooting in the dark.