[Kintsukuroi.]

Carbohydrates are turned into glucose when eaten which means they do cause your blood sugar levels to rise. However, this doesn't mean carbs are necessarily "bad" but need to be eaten smartly. Instead of eating refined carbs (ie white flour) it's better to eat whole grain foods. Has he seen a dietitian (medical nutrition therapy)? The amount of carbs that he should be eating varies with activity levels and body size and some other factors, which a dietitian can help in creating an eating plan which explains your carb needs, etc. On average, an adult starting point for carbs are 45-60g but of course that is just an average and can vary for each individual.

I don't eat meat but this site has some recipes that could be useful to check out.

Also, there are low carb options for pasta that still taste good. You can check out Shirataki noodles. The tofu ones do have 3g of carbs per serving but MIracle noodles have some that are very low to none carbs. Zoodles (zucchini pasta noodles), spaghetti squash, eggplant which can be used in lasagna all are fairly low in carbs.

You can always check out whole grain pastas with fiber as well as those are healthier than white pastas. You can check out this brand for lower carb pastas but portion sizes are key.

There is also other options for foods with proteins like beans, lentils, peas, tofu, fish/seafood, etc that can be used to mix up meal options.