Monkeys can get diabetes. Some species are more prone than others.
IMO the saving grace of fruit is its sugar composition. It is usually 50:50 fructose and sucrose.
Sucrose is sugar, 50:50 fructose and glucose. Glucose is the sugar that requires insulin, and shows up on blood tests.
Fructose is processed by the liver. OTOH, fructose overload can cause non-alcoholic fatty liver disease ( NAFLD ).
Lactose is present in milk, regular yoghurts, and soft cheeses. It is also processed by the liver, again potentially causing NAFLD.
Hard cheeses contain very little lactose, I eat as much as I want.
People drinking skim milk, marketed as healthy , is ironic. Skim milk is actually enriched in lactose.