A diet high in refined carbohydrates may contribute to the onset of acne by elevating blood sugar as well as insulin levels.
However, additional research needs to be done.
There is a correlation between dairy consumption and acne magnitude,
but it is unclear whether or not there is a causal relationship.
Regular consumption of fast-Food has been associated with a higher probability of acne,
it is unclear whether or not it causes acne.
New evidence suggests a correlation between chocolate consumption and the onset of acne,
albeit the exact mechanisms at play and the degree of the association are yet unknown.
A few studies have found an association between whey protein supplements and acne,
high-quality studies are needed to draw any firm conclusions.
Acne may be made worse by an increase in systemic inflammation brought on by food sensitivities.
No research has been done on this, though.