The medications that change who we are

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43. Not just drugs-- article mentions a low fat diet can also make people more aggressive.

Filled with fresh determination, Golomb scoured the scientific and medical literature for clues. “There was shockingly more evidence than I had imagined,” she says. For one thing, she uncovered findings that if you put primates on a low-cholesterol diet, they become more aggressive.

Golomb remains convinced that lower cholesterol can cause behavioural changes in both men and women
There was even a potential mechanism: lowering the animals’ cholesterol seemed to affect their levels of serotonin, an important brain chemical thought to be involved in regulating mood and social behaviour in animals. Even fruit flies start fighting if you mess up their serotonin levels, but it also has some unpleasant effects in people – studies have linked it to violence, impulsivity, suicide and murder.