Isn't 'plant-based' just a fad with no real health benefit?
Short answer: No. Cohorts followed for decades link plant-based eating to lower heart disease, type 2 diabetes and mortality. Fads don't do that.
Honest caveat: the same study found ~20% more total stroke in vegetarians, well-planned still matters.
EPIC-Oxford (Tong et al., 2019)
The objection
“Plant-based is just a fad with celebrity hype and no real evidence behind it.”
The answer
Fair warning, diets do come and go on thin evidence. So hold this to the standard a fad can’t meet: large populations followed for decades. If the benefit is real, it shows up there. It does.
EPIC-Oxford followed tens of thousands of British adults for over 18 years: vegetarians had 22% lower rates of ischaemic heart disease than meat-eaters. The Adventist Health Study-2, tracking tens of thousands of Americans, found vegans and vegetarians with roughly half the prevalence of type 2 diabetes, lower blood pressure, lower BMI, and an all-cause mortality hazard ratio around 0.85–0.91 versus non-vegetarians. Separately, the WHO’s cancer agency classes processed meat as a Group 1 carcinogen for colorectal cancer.
That is not the footprint of a fad. Fads don’t generate concordant findings across independent cohorts on two continents over thirty years.
The honesty that makes this credible: these are observational studies, association rather than proof of cause. It’s fair to ask whether vegetarians are simply healthier people, since they smoke less, drink less and exercise more. Good researchers know this, which is why these studies statistically adjust for those factors, and the benefits largely persist. Mechanistically it coheres too, with lower saturated fat, higher fibre, more potassium and polyphenols. But the careful phrasing is “strongly associated with,” not “guaranteed to cause.”
And the honesty cuts both ways. The same EPIC-Oxford analysis found vegetarians had a 20% higher rate of total stroke, driven mainly by haemorrhagic stroke, a reminder the diet must be well planned, with B12 and adequate nutrients.
So the defensible claim: a well-planned plant-based diet is consistently associated with lower risk of cardiovascular disease, type 2 diabetes, several cancers and overall mortality in the largest studies we have. Not a cure-all, and not a fad either. It is one of the better-evidenced dietary patterns in nutrition science, which is a strange thing for a fad to be.