I find it hard to endorse any letter I've tried, but Consumer Reports On Health wasn't bad. Nutrition Action from the center for science in the public interest is ok for $7 a year (you need to miss a few issues before they offer you that rate). But both of those often have "dumb" articles, based on old thinking. For instance still insisting that lowering LDL-C is what you should be concerned with, and poo-pooing a reduced carbohydrate diet. It's crap like that that makes me question all of the content. I know they have various contributors, each with their own baggage/cognitive dissonance issues, but I'd like to think the editors could do better.