Think vegetable crisps might be a healthier alternative to potato chips? Think again, says a recent study which has highlighted the high fat and salt content of vegetable crisps.

The research, carried out by nutritionist Charlotte Stirling-Reed, shows that packets of the popular snack consist of up to a third salt and oil.

It's not the only food that might be misleading you. Coconut oil has long been heralded as a healthier alternative to other cooking oils by clean eating gurus. However, according to new advice from experts, it's as bad for you as beef dripping.

The problem is the oil's high saturated fat content - 87 grams per 100g – which is linked to cardiovascular disease. In a review published in the journal Circulation, the American Heart Association wrote: "Taking into consideration the totality of the scientific evidence, satisfying rigorous criteria for causality, we conclude strongly that lowering intake of saturated fat and replacing it with unsaturated fats, especially polyunsaturated fats, will lower the incidence of CVD."

They found that sticking to a diet low in saturated fats could potentially prevent up to 5.2 million deaths from stroke, heart disease and other cardiovascular problems worldwide each year.

Not good news for coconut oil, then, which the AHA says promotes bad cholesterol and is on par with other saturated fats like butter and beef fat.