What is the best diet for someone who has Down syndrome?

The nutritional needs for child with Downs Syndrome would be same as any child with two possibly three difference: Their immune system tends to be weaker so more fruit would help with vitamin C; Since their activity level maybe lower than average child watching how much calories they intake would be helpful to guard against over weight; Many take anti-seizure medication Dilatin which hamper the body naturally getting B12 from food so more dark green vegetables including broccoli spinach dark green lettuce might help because they have high levels of B12. Not sure of other anti-seizure medication, but they all seem to have same side effects.