Yep, sometimes a few minutes, sometimes a few days. A snicker's bar with trans-fats and all the rest? My skin almost immediately feels oily and gross. Possible boils within hours, hydrogenated soybean oil = Lucifer. Dairy has a more cumulative effect, zits within days if I eat too much too often - but I can get away with a bit. Wheat, my joints hurt the next morning and it takes a few days to get rid of the pain.
Steak, eggs, potatoes - fruits, nuts, berries and forage. Coconut milk and potent herbs and spices. Tea instead of coffee now and teeny amounts of kelp daily. Let's see how this does! Not really had dairy much, and gut seems better for it.