Nearly one-third of coronavirus cases could have been avoided if people had a healthy diet that includes lots of fruit and vegetables, claims a new study.

While getting vaccinated and wearing a mask indoors and in crowded spaces is paramount, the research, published in the journal Gut, suggests that eating properly may reduce the risk of contracting Covid-19, the Jerusalem Post reported.

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The study, led by researchers from Massachusetts General Hospital in Boston, showed that people who had a healthier diet had a 9 percent lower risk of contracting the virus compared to people who ate a poorer diet.

Those who ate healthier were 41 percent less likely to develop severe symptoms.

Although doctors have stated that metabolic conditions including obesity and Type 2 diabetes can cause severe coronavirus complications, this study is among the first to add nutrition to the equation, the report said.

Previous studies have suggested that poor nutrition is a widespread trait among groups disproportionately affected by the epidemic, but data on the link between diet and the risk of getting the virus and then developing severe symptoms is lacking, said study editor Jordi Marino, a doctoral student and instructor at Harvard Medical School.

The team analysed data collected on 592,571 people from the US and the UK between March and December 2020. Each participant completed a survey of their dietary habits, with study authors scoring people’s “diet quality,” with an emphasis on fruit and vegetable consumption.

During the follow-up period, 31,831 participants developed Covid-19.

The researchers also observed a cumulative link between poor nutrition, increased socioeconomic deprivation, and Covid-19 risk.

People who live in poor neighbourhoods and who rely heavily on fast food are much more susceptible to the virus.

Models estimate that nearly a third of virus cases would have been avoided if one of these two conditions didn’t exist, explained Marino.

The researchers called for making healthy, plant-based foods more available and affordable to help advance the end of the epidemic.

“Our findings are a call for governments and those who develop protocols to prioritize healthy eating and welfare with influential policies,” Marino said.