There's no shortage of shakes that CALL themselves Keto but they are made with WHEY protein that spikes your insulin. Read the research: Research shows that while whey protein causes an increase in serum levels of leucine, isoleucine, and valine, it also causes an increase in the hormone glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide 1 (GLP-1). The most interesting finding in this study is that not only did whey protein caused an increase in serum insulin levels, it caused an increase of insulin, GIP. GLP-1 greater than carbohydrates from white bread. Yep. Whey protein is worse than white bread.