You just can't extrapolate much from a study of this size, for this effect size, with this many confounding factors. The difference in effect sizes were percentages, not orders of magnitude.
The best you can say is: "no evidence found of non-efficacy for these 3 diets. Effect sizes comparable to within 10% of each other."
There's no way to interpret this as "x diet is the best"
The best you can say is: "no evidence found of non-efficacy for these 3 diets. Effect sizes comparable to within 10% of each other."
There's no way to interpret this as "x diet is the best"