What digestive adaptation is necessary due to their high-fruit and moderate-leaf diet?

Answer

Optimization for fermentation to extract energy from fiber and rapid sugar absorption

The staple diet, being heavy in fruit (sugars) and containing moderate amounts of leaves (cellulose/fiber), demands a sophisticated digestive system. This system must be adept at bulk feeding. Specifically, it is optimized to handle two different demands simultaneously: utilizing gut fermentation processes to extract maximum available energy from fiber-rich materials like leaves when necessary, while also ensuring the efficient and rapid absorption of the high concentration of sugars derived from ripe fruit pulp.

What digestive adaptation is necessary due to their high-fruit and moderate-leaf diet?
fooddietanimalMonkeyPrimate