“Protein powder is great for vegetarians,” says nutritionist and personal trainer Aynsley Kirshenbaum. Or kids who are picky eaters. Kirshenbaum adds protein powder to her kids’ macaroni and ...

Protein is an important part of a child's diet, so it's understandable parents may be tempted by products marketed as having added protein. Some muesli bars, for example, are labelled "protein ...