ved Indiana University School of Medicine trekker fram en systematisk studie om søtemidler i maten:
A 2011 systematic review of studies looking at the effects of artificial sweeteners on clinical outcomes identified 53 randomized controlled trials. That sounds like a lot. Unfortunately, only 13 of them lasted for more than a week and involved at least 10 participants. Ten of those 13 trials had a Jadad score — which is a scale from 0 (minimum) to 5 (maximum) to rate the quality of randomized control trials — of 1. This means they were of rather low quality. None of the trials adequately concealed which sweetener participants were receiving. The longest trial was 10 weeks in length.Carroll har nå gjennomgått et annet kontroversielt tema som handler om forskningen faktisk støtter at fett i fast form er farligere enn flytende fett som olivenolje. Det Carroll anser som solide studier viser at det ikke er mindre dødlighet ved å sette hjertepasienter på "hjertevennlige" dietter.
Moreover, the researchers conducted a meta-analysis of all studies that looked at this question. Analyzed together, they still found that more people died on the linoleic-acid-rich diets, although the results were not statistically significant. Even in a sensitivity analysis, which included more studies, no mortality benefit could be found with a diet lower in saturated fats.