Study highlights nuanced guidance on fruit intake for people with heart and metabolic conditions

A large US study reveals that while people with cardiovascular disease tend to eat less whole fruit, the impact of fruit juice remains less clear, underscoring the importance of portion control and diet context for those at risk.

A large US study published in Current Developments in Nutrition has added to a long-running debate about whether people with diabetes or cardiovascular disease should limit fruit. The analysis, which covered more than 370,000 adults, found that people with high blood pressure, high cholesterol, coronary heart disease or a previous heart attack reported eating whole fruit less often than those without those conditions. The link was less clear for 100% fruit juice, suggesting that whole fruit and juice may not affect diets, or perceived diets, in the same way.

The findings should not be read as proof that fruit intake protects against heart disease, or that low fruit intake causes it. Because the research was cross-sectional, it can only show an association at one point in time. That means it is also possible that people changed what they ate after receiving a diagnosis, rather than fruit intake shaping the diagnosis itself. Dietitian Amreen Sheikh of KIMS Hospitals in Thane said some people become overly wary of foods containing natural sugars once they are told they have a health condition, and may incorrectly interpret advice to “reduce sugar” as a need to avoid fruit altogether.

The distinction between whole fruit and juice largely comes down to fibre. In whole fruit, fibre, water and plant compounds remain intact, which slows digestion and helps delay the release of naturally occurring sugars. That also makes whole fruit more filling. Juice, even when it is 100% fruit juice, has far less fibre and can be easier to drink in larger amounts. Sheikh said that does not make juice the same as a sugary soft drink, but she still regards whole fruit as the better everyday choice.

Other research supports a more nuanced picture. A 2022 study indexed in PubMed found no significant link between 100% fruit juice and overall or cardiovascular mortality in US adults, while a 2020 meta-analysis reported a non-linear inverse association between low-to-moderate juice intake and the risk of stroke and total cardiovascular events, with the lowest risk at around 78 millilitres a day. A 2021 dose-response review found a small association between higher juice intake and mortality, but said the evidence was of low certainty. Earlier work in 2010 found no clear association between 100% fruit juice and obesity or metabolic syndrome.

For most people with diabetes, high cholesterol or heart disease, the practical message is not to cut out fruit but to control portions and fit them into the wider diet. Sheikh suggested a single serving at a time, such as a small apple, orange or guava, a small bowl of papaya, or half to one cup of berries. She also recommended pairing fruit with protein or healthy fat, such as nuts, seeds or yoghurt, to make it more satisfying and help with glucose control. As she noted, fruit is only one part of the picture; physical activity, body weight, smoking, income, education, access to fresh produce and overall eating patterns all influence cardiovascular risk.