On Getting the Advice Half Right

Most bad health advice isn’t a lie. It’s a half-truth that stopped halfway through the explanation — and the missing half is usually the useful one.

This week we found three of them, and they follow the same pattern. Cold plunges genuinely work, which is exactly why they blunt your muscle growth if you take one straight after lifting. Probiotics genuinely help after antibiotics, but not with the thing everyone takes them for. Raw milk is genuinely different from pasteurised, just not in any of the ways it’s sold to you.

In each case the popular advice isn’t wrong so much as incomplete — and the part that got left out changes what you should actually do.

— The Vitae Team

The meta-analyses are damning: ice baths after lifting blunt muscle growth. But the science hasn’t turned against cold plunges — it’s turned against when you take them.

Antibiotics clear the infection and a good deal of your gut microbiome with it — and recovery takes months, not days. The standard advice to reach for probiotics is more complicated than it looks.

Legal in England, outlawed in Scotland since 1983, and increasingly fashionable. The health claims mostly don’t survive scrutiny. The outbreak data does.

An estimated 2,700 people died in England and Wales during the May and June heatwaves. Almost none of them died of heatstroke.

Women do die slightly more often in heatwaves. But the popular explanation — that female bodies simply cope worse with heat — is mostly a myth.

Every study showing blunted muscle growth applied the cold within 15–20 minutes of training. Plunge in the morning, lift in the evening — you keep the benefits and lose the interference.

The evidence for probiotics is specifically about preventing antibiotic-associated diarrhoea — and in the trials they were started alongside the course, not after it.

The real work of rebuilding a gut microbiome is done by fibre and plant variety, not capsules. Different bacteria eat different plant fibres — so range matters as much as quantity.

Most heat deaths aren’t dramatic, and most happen during ordinary yellow alerts rather than record-breaking extremes. A phone call to someone elderly or unwell, living alone, is one of the highest-value things you can do.

There’s a pattern worth noticing in all three of this week’s pieces. In each case the intervention does something real — cold genuinely reduces inflammation, probiotics genuinely colonise the gut, raw milk genuinely contains live bacteria. The problem isn’t that they don’t work. It’s that what they do isn’t quite what people assume, and the gap between the two is where the bad advice lives.

Which is a decent argument for asking, of any health claim: what is this actually doing, and is that the thing I want done?

Back next Wednesday.

The Vitae Team