Much of medical science - perhaps especially nutritional science - is unfortunately biased, based on old failed paradigms, or funded by big industries with an agenda, like Big Sugar.
However, bias is something that everyone has. And conflicts of interest exist in all camps. For example, some companies selling ketone supplements (not something we recommend) have affiliations with ketogenic researchers, where there are potential conflicts of interest.
In the interest of full disclosure, here's a new critical investigation into how some keto scientists are connected to keto companies:
Sci-Fit.net: How keto scientists connect to keto companies (a critical investigation)PS
Of course, there's also plenty of independent science supporting the positive effects of low-carb diets.
Note
To minimize our bias at Diet Doctor we show no ads, sell no products and take no industry money. We're fully funded by the people, via our optional membership.