Many cancers could be avoided by making healthy choices like eating well and exercising. For women, about 4 out of 10 cancers might be prevented this way, and for men, it's about 6 out of 10.
Evidence from Studies
Supporting (2)
Community contributions welcome
Global and regional cancer burden attributable to modifiable risk factors to inform prevention.
The study looked at things like smoking, drinking, and being overweight, and found they cause about 38% of cancers overall—30% in women and 45% in men, which is pretty close to the claim's numbers, so it supports the idea.
The study says that things like not smoking, eating healthy, and exercising can help prevent cancer, which matches the claim, but it doesn't give exact numbers like 40% or 57%, so it supports the idea generally.
Contradicting (1)
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Cancer cases attributable to modifiable lifestyle risk factors in Switzerland between 2015 and 2019
The study looked at lifestyle factors like smoking and diet in Switzerland and found they cause fewer cancers than the claim says, so the claim seems too high.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.