

The researchers found that GI values for different potatoes varied significantly depending on type of potato and cooking method. Interestingly, boiled red potatoes eaten hot after cooking had the highest GI, while boiled red potatoes eaten cold had the lowest GI of any of the types of potatoes tested (they're considered moderate GI). Cooking potatoes with dry heat methods, such as baking and roasting, instead of with water also helps to lower GI. The researchers speculate that since potatoes contain different types of starch, some of the starch becomes highly digestible when it cooks, especially when cooked with liquid. As it cools, some of the digestible starch is converted to indigestible starch, which has less of an effect on blood sugar when eaten.
To keep the GI low, you can reheat your cooled potatoes and then eat them, or lower GI further by cooling them a second time (reheating optional). You can also lower GI by combining high-GI foods, like most potatoes, with some protein and fat and by eating smaller portions.
Zucchini and other summer squash are about 95% water—which means they are very low in calories and only moderate in vitamins and minerals. They do contain a fair amount of phytonutrients, though. Vitamin C, Vitamin A, beta carotene, lutein, and zeaxanthin are all present (mostly in the skin) and can help boost your health. Beta carotene is converted into vitamin A in the body, where it acts as an antioxidant and may help prevent cataracts and cancer. Lutein and zeaxanthin, other carotenoids, also act as antioxidants to protect against macular degeneration in the eyes, and may prevent plaque from building up in the arteries. A serving of zucchini is 1/2 cup. It contains about 10 calories, 2 grams of fiber, and about 20% of our daily potassium and vitamin C needs. Zucchini is available all year round at Gelson's, with Italian squash, golden zucchini, and squash blossoms being available in the summer months. When selecting your summer squash, look for small to medium specimens no more than seven inches long, since more mature fruits can be coarse and stringy with large seeds. Skin should be firm and glossy and it should feel heavy for its size. When you bring them home, store them in their plastic bags in the crisper and use them within a week. Wash them and trim the ends just before using. Zucchini can be eaten raw, and can be cooked many ways. Keep in mind that because of their high water content, they produce a lot of water when they're cooked. In order to avoid this, you can cut, salt, and drain them (like eggplant), blanch them whole for 2-4 minutes, or shred them and press the shreds between layers of paper towels. This will help with browning if you're sautéing and minimize wateriness if you're baking. Zucchini is wonderful when baked, sautéed, stir-fried, and even steamed. It pairs especially well with other summer squash, tomatoes, eggplant, onion, basil, mint, oregano, black pepper, and parmesan cheese. This month, try my recipes for Sautéed Zucchini and Mahi Mahi with Southwestern Succotash.
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