In a double-blind crossover trial of 23 adults with overweight or obesity (mean BMI 36.4) and mild hypercholesterolemia, 8 weeks of 2 g/day plant sterols produced no LDL-cholesterol reduction versus placebo (p = 0.632). LDL changed +0.1 mg/dL after sterols (95% CI -7.1 to 7.3) versus +3.9 mg/dL after placebo. Other lipids, hs-CRP, glucose-regulation markers, body composition, and sarcopenia measures also showed no effect that survived multiple-testing correction.
This result cuts against one of the most reliable findings in nutrition. In normal-weight people, 2 g/day of plant sterols typically lowers LDL by roughly 8-10%, and that figure underpins their inclusion in dietary guidance and fortified foods. A null result in obesity suggests the benefit may not transfer, possibly because higher cholesterol synthesis relative to absorption in people with obesity blunts sterols, which work by blocking intestinal cholesterol uptake. The authors raise this explanation, but the trial cannot test it.
Interpret with caution. Twenty-three participants is small, the confidence intervals are wide enough to hide a modest effect, and the crossover design with only an 8-week phase says nothing about long-term cardiovascular outcomes. Secondary analyses were explicitly underpowered. Still, adults with obesity who rely on sterol-fortified spreads or supplements for cholesterol control should not assume the typical benefit applies to them. Statins, dietary pattern, and weight loss have far stronger evidence. Editorially, this is a small but useful challenge to an assumption, not a definitive refutation; larger trials stratified by BMI are needed to settle it.