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Since when do insulin spikes cause inflammation? Insulin spikes are a natural occurrence whereby the body releases insulin into the bloodstream to push glucose into cells to be converted into ATP, there is no ‘inflammation’ in that biological process strictly speaking.
Your body releases insulin even when you consume amino acids.
Diary reacts differently to different people, the gut in many ways is the first contact point of the immune system, so people with diary allergies can have adverse reactions to diary, causing the body to have an inflammatory response.
If you have diary allergies, any kind of diary alternate milk is a good option. But insulin should be the least of your worries unless your t1/t2 diabetic.