Hi Mixal, Eat nuts such as almonds, hazlenuts (avoid peanuts as they are high in saturated fat) as a snack between lunch and dinner but be careful not to eat too many. In answer to the tomato sauce why not try making your own once - you will be hooked as it is so much nicer and so easy. Simply put them into just boiled water for a minute or two, then put them into cold water. Peel off the skins and chop them up. I leave in all the seeds but you may want to remove them. In a tiny bit of olive oil (keep fat low because pasta has higher GI) fry the tomato with some onion, peppers until soft and then blend it altogether and pour over you pasta or vegetables. Tomatoes have low GI so I don't think you have to worry too much about quantity of the sauce but I would be careful about the quantity of pasta and make sure it is cooked al dente - don't over cook it.
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