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Tom Watson's successful reversal of type-2 diabetes should certainly be celebrated, but to extrapolate the success of one individual to a nationwide obesity solution is unwise at best and irresponsible at worst.

My own personal experiences suggest that a low-sugar (or low-GI) diet deliver better (weight, blood pressure etc.) results than low-fat, but I wouldn't use personal experience to call for a policy change.

By all means, call for the re-evaluation of scientific studies (a la Ben Goldacre and AllTrials), but jumping to conclusions that suit the author is following in the alleged bad practice of the "self-interested food processors, and the government’s so-called expert scientific advisors".

Let scientific method prevail.