Our knowledge about how nanomaterial food additives react in the body and their health impact is still in its infancy.

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They did, though, give a warm response to N-acetyl-cysteine - an amino acid supplement sold in health food stores, thought to work by increasing the body's ability to mop up destructive chemicals which build up in the liver as enzymes break down ethanol.

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By controlling for individual and environmental influences on weight, such as income and health, they then measure whether food-price changes affect body-mass index (BMI).

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"OK, scientists are still arguing about the dietary determinants of breast cancer and aren't too worried about fat, but they do worry about body weight, " the professor of nutrition, food studies and public health posted on her blog.

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