The researchers analyzed data from 277 randomized controlled trials to determine the effects of 18 nutritional supplements and 8 diets on the health of almost 1 million adults.
They considered these supplements: selenium, multivitamins, calcium plus vitamin D, beta carotene, iron, folic acid, omega-3 long-chain polyunsaturated fatty acids, calcium, antioxidants, vitamins A, B complex, -3, B-6, C, D, and E.
But, calcium plus vitamin d intake was linked to an increased risk for stroke.
However, scientists have urged caution in interpreting the results as establishing cause and effect is the field of nutrition is notoriously hard.
Now, a meta-analysis by researchers from different collaborating institutions - including The Johns Hopkins School of Medicine in Baltimore, MD, West Virginia University in Morgantown, and Mayo Clinic in Rochester, MN - suggests that many interventions and even more supplements may have no protective effect for the heart, and some may even harm cardiovascular health.More news: US women's soccer team captain accepts Capitol invitation
NHS advice states that most people do not need to take vitamin supplements because they should receive all the vitamins and minerals they need by eating a balanced diet.
The research team found that low-salt diets reduced the risk of death overall in those with normal blood pressure, but not in those with high blood pressure.
The findings had been unsurprising, mentioned Susan Jebb, a professor of diet and inhabitants health at the University of Oxford.
The study said, "The role of nutritional supplements and dietary interventions in preventing mortality and cardiovascular disease (CVD) outcomes is unclear".
The new research, which included nearly a million patients overall, also found limited evidence that a low-salt diet may reduce the risk of death, but in an editorial accompanying the review, experts called that a "peculiar and controversial finding".More news: Ekta Kapoor`s ALTBalaji issues apology over ugly spat between Kangana Rananut, journalist
Khan advocates for future quality randomized, controlled trials targeting well-defined populations to acquire better answers.
Reduced salt intake was associated with improving overall survival and cardiovascular mortality.
The association said in 2018 that "significant evidence links excess sodium intake with high blood pressure, which increases the risk of heart attack, stroke and heart failure". The examination took a gander at the impacts of 16 distinctive healthful supplements, just as eight unique weight control plans including Mediterranean eating routine and low-fat eating regimen.
On a related note, many individuals believe that taking dietary supplements can enhance different aspects of their health, including heart health, although have contradicted this assumption. Vegetarian diets have also been tied to a lower risk of heart disease.
Other ways to study diet include "population cohort studies" that track populations of people over long periods, looking for connections between behavior and health.More news: Trump Warns Iran "Sanctions Will Soon Be Increased, Substantially"
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