jingl - it is insulin that lays down fat stores in the body, or arteries, if we're specifically talking arteries, or in the liver.
Insulin is the substance secreted when blood sugars exceed 'normal ' - it 'mops up' excess and, as it has to go somewhere (as per the Law of Conservation of Mass) it stores the excess glucose in fat cells.
The reason for surges in blood sugar levels is excess sugar. Carbohydrates are easily broken down into their constituent sugars and hit the blood stream PDQ.
Fats also break down into their constituent sugars through the process of digestion. BUT it is much harder for the digestive system to break them down and it takes much longer. Consequently the sugars from fats take longer to reach the blood steam and are released more slowly so very little chance of a 'sugar high'.
I think some people think that fats enter the bloodstream as little droplets of fat. They don't. Fats are broken down into sugars too.
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. Worry more about any mayonnaise there might have been in the sarnie.