Cashew Myths vs Facts: Heart, Weight and Nutrition

Cashews pick up a lot of health folklore: that they're bad for your heart, that they pile on weight, that they're just empty calories. We checked all three against the research. None of them hold up, though the real picture has a little more nuance than a one-line fact.

Mostly a myth. Roughly 70 percent of the fat in cashews is unsaturated, the kind generally linked with better heart health, and regular nut eating in general is associated with a lower risk of heart disease in large studies.

The nuance is that the evidence on cashews specifically is smaller. A review of cashew trials found they can improve blood pressure and triglycerides, but no clear effect on total or LDL cholesterol. So cashews are a reasonable part of a heart-friendly diet, but they aren't a cholesterol-lowering food. Salt matters too: lightly salted or unsalted cashews keep the benefit without the extra sodium. We cover the basics in our post on cashew nutrition and benefits.

The word that's wrong here is always. A large review of 86 randomized trials and six long-term studies found that eating nuts does not increase body weight, and in some analyses was linked with slightly lower weight over time.

That said, cashews are calorie-dense: a 28g handful is roughly 155 calories, and it's easy to eat three handfuls without noticing. The simplest approach is to let cashews replace a less satisfying snack rather than adding them on top, and to measure a handful out instead of eating from the bag. See how that compares with other nuts in our cashews vs other nuts comparison.

Definitely a myth. Per 100g, raw cashews contain about 18g of protein, around 292mg of magnesium and 2.2mg of copper, along with iron and zinc. A 28g handful covers roughly two-thirds of a typical adult's daily copper and about a fifth of their magnesium.

Copper and magnesium are where cashews stand out from other common snack nuts, which is a big part of why a small handful feels like more than just a snack.

All three myths are false, but cashews aren't a miracle food either. They're low in fiber compared with almonds, they're calorie-dense, and added salt or sugar changes the picture. Portion size and what's added to the nut matter more than the nut itself.

If you want to put that into practice, you can browse our cashews and check each product page for what's in it. This is general information, not personal medical or dietary advice.