The fitness and weight loss industry survives on a simple and endlessly exploitable gap between what people want to be true and what the evidence actually shows. What people want to be true is that there is a product — a shoe, a supplement, a tea, a device — that makes weight loss easier, faster, or less effortful. The evidence shows there is not.

Toning shoes — rounded-sole footwear marketed on the claim that their unstable design engages more muscles and burns more calories — were investigated by the American Council on Exercise in a controlled study. The researchers found no significant difference in muscle activation or caloric expenditure between toning shoes and regular athletic footwear. The Federal Trade Commission subsequently took action against manufacturers for deceptive marketing claims. The shoes were a fraud.

Green tea extract, consistently marketed as a metabolism booster, has been studied extensively. Meta-analyses of the research find a very small effect on metabolic rate — so small as to be clinically meaningless for weight management purposes, and certainly insufficient to justify the price premium of products that contain it.

Diet pills, whether prescription or over-the-counter, have a record that ranges from modest short-term effect with significant side effects to outright danger. The history of weight loss pharmacology includes multiple withdrawn medications following cardiovascular and psychiatric adverse events.

What does work for weight loss is not a product. It is caloric deficit achieved through a combination of reduced intake and increased activity, sustained over time, in ways that the individual can actually maintain. The difficulty of this approach is that it cannot be sold in a box. The simplicity of it is that it does not need to be.