Monkeys like to eat bananas because these sweet fruits are found in the wild where primates live. Monkeys are omnivores that eat fruit, vegetables and foliage, not just bananas, according to the Great Ape Trust.
While bananas found in the wild are part of a monkey's regular diet, bananas sold at supermarkets and produce stores may not be healthy for monkeys. The Paignton Zoo in Devon, England, announced that it is weaning monkeys off of cultivated bananas because they contain too much sugar and not enough protein, according to the BBC. These bananas can cause gastrointestinal issues in monkeys, so the zoo is now feeding its monkeys a diet of leafy vegetables and leafy branches instead.