Fibre: The Forgotten Macro With Outsized Returns
It does not get marketed. It is not on most food labels in big letters. And it is one of the single best-evidenced nutrients of the last 30 years.
The 30g target
Most adults eat 12–18 grams of fibre per day. The evidence-backed target sits around 25–35 g/day, with the upper end correlating with the lowest rates of cardiovascular disease, type-2 diabetes, colorectal cancer and all-cause mortality across cohort studies.
Where it comes from
Beans and legumes are the densest, cheapest source — half a cup of lentils delivers 8 g. Whole grains (oats, barley, intact wheat), berries, apples with skin, broccoli, and nuts close most of the remaining gap. The "30 plants a week" heuristic correlates surprisingly well with the 30 g/day target.
Ramp up gently
Going from 15 to 35 g overnight will not feel good. Add 5 g per week, drink more water alongside it, and your gut will adapt within a month. The microbiome rewards patience.
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