There are lots of theories about different foods you can eat to increase your milk
supply — natural food stores sell supplements, and I've heard that drinking atole (a thick,
sweet Mexican drink made with
corn starch or
corn meal) can help — I don't know whether that's true, but you should talk with your OB / GYN and do some research and experimenting to see what works for you.
If you're not a berry aficionado, don't forget: anthocyanins can also be found in good
supply in red cabbage, black plums, Concord grapes, dark cherries, purple
sweet potatoes and purple
corn.