Dr Schwartz https://dr-schwartz.com/ Evidence, weighed. en-gb Does vitamin C stop you catching colds? https://dr-schwartz.com/does-vitamin-c-stop-you-catching-colds.html https://dr-schwartz.com/does-vitamin-c-stop-you-catching-colds.html Tue, 28 Jul 2026 22:34:18 GMT Decades of Cochrane trials find no meaningful drop in cold risk for ordinary adults, only a modest shortening of colds once they start. How we weigh the evidence https://dr-schwartz.com/how-we-weigh-the-evidence.html https://dr-schwartz.com/how-we-weigh-the-evidence.html Mon, 27 Jul 2026 08:00:00 GMT Every claim we assess carries the same two marks: how strong the evidence is, and which way it points. This is the method behind them — and the reason we sometimes say "we don't know." The evidence pyramid: why not all studies are equal https://dr-schwartz.com/the-evidence-pyramid.html https://dr-schwartz.com/the-evidence-pyramid.html Sat, 25 Jul 2026 08:00:00 GMT "A study found" tells you almost nothing until you know what kind of study it was. A quick tour from anecdote to meta-analysis. Relative vs absolute risk: the trick behind scary headlines https://dr-schwartz.com/relative-versus-absolute-risk.html https://dr-schwartz.com/relative-versus-absolute-risk.html Thu, 23 Jul 2026 08:00:00 GMT "Doubles your risk" and "raises it from 1 in 10,000 to 2 in 10,000" can describe the exact same finding. One sells papers; the other tells you what to do. What scientists mean by "consensus" https://dr-schwartz.com/what-scientists-mean-by-consensus.html https://dr-schwartz.com/what-scientists-mean-by-consensus.html Tue, 21 Jul 2026 08:00:00 GMT A scientific consensus is not a vote, and not a demand for silence. It is what remains standing after decades of people trying to knock it down. How a single study becomes a myth https://dr-schwartz.com/how-a-single-study-becomes-a-myth.html https://dr-schwartz.com/how-a-single-study-becomes-a-myth.html Sun, 19 Jul 2026 08:00:00 GMT The pipeline from a modest finding to a confident health myth is short, well-worn, and easy to spot once you know the stations it passes through. Does sugar make children hyperactive? https://dr-schwartz.com/verdict-sugar-and-hyperactivity.html https://dr-schwartz.com/verdict-sugar-and-hyperactivity.html Fri, 17 Jul 2026 08:00:00 GMT It is one of the most confidently repeated claims in parenting. It is also one of the most thoroughly tested — and the tests do not support it. Do you need eight glasses of water a day? https://dr-schwartz.com/verdict-eight-glasses-of-water.html https://dr-schwartz.com/verdict-eight-glasses-of-water.html Wed, 15 Jul 2026 08:00:00 GMT The famous rule is everywhere. A clear scientific basis for it is not. Where the evidence stands: physical activity https://dr-schwartz.com/where-the-evidence-stands-physical-activity.html https://dr-schwartz.com/where-the-evidence-stands-physical-activity.html Mon, 13 Jul 2026 08:00:00 GMT On a subject where much is contested, this one is not: across an enormous body of research, regular movement is among the best-supported things you can do for your health.