A Note on Honest Doubts
Nutrition science is among the noisiest of all the sciences, and a book that hid that fact would be doing the reader a disservice. Much of what we know rests on observational studies — populations watched over years — which can show that two things travel together but never quite prove that one causes the other; the gold-standard controlled trial is, for a lifetime's diet, very nearly impossible to run. The result is a field in which yesterday's certainty is often tomorrow's correction, and in which a single dramatic study should always be met with a raised eyebrow rather than a changed dinner. This volume has tried, throughout, to distinguish what is well established (the value of plants, fibre, and dietary pattern; the harm of trans fats and a diet built on ultra-processed food) from what is genuinely still argued over (the fine detail of saturated fat, the optimal target for salt, the reality of the Blue Zones), and to say plainly which is which. Where the evidence was thin, the honest course was to say so, and to trust the reader with the uncertainty rather than paper over it.
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