Red lentils deliver real protein, but the fat-free claim doesn't survive scrutiny.

Other research on lentils found they contain about a quarter to a third protein by weight, which is a high level for a plant food, so the protein part gets some support. But a different study checked whether cooked red lentils meet official rules for calling a food a protein source and found they don't clear that bar, so the 'high protein' label is contested. On the fat-free claim, other research measured fat in lentils including red lentils and found they do contain fat, so 'fat-free' isn't accurate. The studies weren't linked in the post, and the protein findings point in different directions.