Agree with pilgrim, but yes if you match the insulin correct u will stop the spikes. However, the larger or fattier the meal you will find it hard to match the insulin as often you will get an initial rise in bg levels, and another rise 2~4 hours later. This is because your body can't digest the foods over 2 hours as it is either too big or to much fat slowing digestion. Often when doing this people take an initial dose of insulin followed by another 1~2 hours later to match digestion. This is hard to do and takes alot of trial and error to see how your body copes. Also as said the more insulin used the more weight will be put on. I don't limit my carbs and would say I have a normal (non diabetic) diet, with the occasional treat as a normal person would have. Regular excercise and tight control is key.
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