Health Evidence Library
Curated research from trusted sources. Transparent. Cited. Always free.
5 records match your filters
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Do ultra-processed foods cause weight gain?
Hall KD et al. · Cell Metabolism · 2019
One tightly controlled National Institutes of Health trial showed that an ultra-processed diet caused people to eat more and gain weight over two weeks. That is real causal evidence. It is also one small, short study, so it cannot tell us which ingredient or processing feature caused the difference. The useful next step is to replace the foods that make it easiest to eat fast and keep eating, not to treat every packaged food as the same problem.
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Do omega-3 fatty acid supplements reduce symptoms of depression?
Appleton KM et al. · Cochrane Database of Systematic Reviews · 2021
The evidence is mixed. Some meta-analyses of randomized trials find a modest reduction in depression symptoms with omega-3 supplementation, particularly formulations high in EPA, while the most rigorous Cochrane systematic review found the evidence overall is low to moderate certainty and any benefit, if real, appears to be small.
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Does following a Mediterranean diet reduce the risk of dying from any cause?
Sofi F et al. · BMJ · 2008
Yes, with strong and consistent support. People who more closely follow a Mediterranean-style diet, rich in vegetables, fruit, whole grains, legumes, olive oil, and fish, with limited red and processed meat, have a lower risk of dying from any cause over long-term follow-up compared with people who follow it less closely.
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Does time-restricted eating improve metabolic health?
Sutton EF et al. · Cell Metabolism · 2018
Short-term evidence suggests time-restricted eating, especially eating earlier in the day within a 6- to 10-hour window, may improve insulin sensitivity, blood pressure, and some cardiometabolic markers, sometimes even without weight loss. Evidence for meaningful long-term weight loss specifically is more mixed, and larger, longer trials are still needed.
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Does vitamin D supplementation reduce the risk of acute respiratory infections?
Martineau AR et al. · The BMJ · 2017
Evidence suggests vitamin D supplementation modestly reduces the risk of acute respiratory tract infections overall, with the clearest benefit in people who are vitamin D deficient at baseline and in those taking daily or weekly doses rather than large infrequent bolus doses.