Acidic fruit boosts your immune system, pineapples, kiwis, strawberries, oranges, tangerines, grapefruit, but don't eat too much grapefruit because an excessive amount of anything can make you sick and it chemically imbalances your body. So just eat everything in moderation. Less starch, less sugar, more whole grains, more fruits, more vegetables, organic that is. But if organic is too expensive then just get the GMO one as a last resort. Also