Last week I wrote about walking after meals. This week, the one supplement I think is genuinely worth understanding — not because it's exciting, but because the evidence is unusually good and almost nobody talks about it honestly.
It's psyllium. Plain soluble fibre. The stuff in Metamucil and every supermarket's own-brand fibre tub.
I know — "fibre" is the least thrilling word in nutrition. Stay with me, because the research here is better than for almost anything else sold for blood sugar.
What the evidence actually shows
A 2015 meta-analysis in the American Journal of Clinical Nutrition pulled together 35 randomised controlled trials of psyllium spanning three decades. In people being treated for type 2 diabetes, taking psyllium before meals produced meaningful improvements in fasting glucose and in HbA1c — the three-month average.
But here's the part I find genuinely useful, and the part the supplement sellers never mention: the benefit was proportional to how much room you had to improve. People with well-controlled glucose saw little. People with higher numbers saw the most. It works where there's the most to fix — which is honest, and rare.
Why it works
Psyllium is a soluble, gel-forming fibre. Taken with water before a meal, it forms a gel in your gut that slows how quickly carbohydrates are broken down and absorbed. Slower absorption means a gentler rise in blood sugar after eating — the same outcome as the "eat in a different order" tactic, reached a different way.
No stimulants. No mechanism that depends on hope. Just physics, in your digestive tract.
The honest limits
This is a modest add-on, not a treatment. It does not replace the things that do the heavy lifting — what you eat, how you move, and any medication your doctor has prescribed. It sits a long way down that list. At its best, it's a small, measurable nudge on top of the foundations.
Two practical cautions: take it with a full glass of water (it expands), and if you're on diabetes medication, talk to your doctor first — because it genuinely can affect glucose, and the timing of other medications, it's worth a conversation rather than a guess.
I put the full evidence breakdown — psyllium plus the other supplements people ask about — on the site here, graded honestly:
If you'd like to try it, the one I point people to is a plain psyllium husk powder (no added sugar, no flavour fillers):
(That's an affiliate link — if you buy through it I earn a small commission at no extra cost to you. It never changes what I recommend or how I read the evidence. The research comes first; the link comes second.)
That's it for this week. One boring, well-evidenced thing, done consistently, beats almost every exciting thing done once.
If you've tried psyllium — or if there's a supplement you're wondering about and want the honest read on — hit reply and tell me. I read every one, and your questions shape what I write.
Talk soon,
Alistair
PureNovus
Educational, not medical advice. If you take blood-sugar medication, check with your doctor before adding anything — even good, boring fibre.