Food contains protean, fat, carbohydrates, etc. Too much of any of them will cause trouble of metabolism. For example, the metabolism of protean needs excreting through kidney. When the metabolites grow out of the capacity of kidney, Nitremia is caused.
Fruits, vegetables, milk, beans, etc. contain rich carbohydrates, which is normally turned into single sugar, then is used by tissues, but the unwanted will be stored as fat, which is why those who do not eat meat, but still get fat.
Those nuts are having more than 50% of fat, while too much puffing food will generate too much energy that is also stored as fat. Too much fat causes overweight, hypertention, etc.
To summary, too much eating for a long time will cause disorder, especially the burden of stomach.