On the other hand, if we eat a meal consisting mainly of protein, both insulin and glucagon are raised. The reason that insulin levels are boosted
is that the hormone stimulates amino acid uptake and protein synthesis. In other words, the hormone is anabolic with regards to protein, which makes sense, as the right time to increase protein production is surely when you've just taken in a whole lot of amino acids! However, without enough carbohydrates in our hypothetical meal, there is the very real risk of insulin causing hypoglycaemia. To counteract this risk, glucagon is also secreted, which causes a stimulation of hepatic gluconeogenesis. This balances the opposing glucose-lowering effects of insulin, thereby preventing hypoglycaemia.