It came to me today this interesting article:

Personalized Nutrition by Prediction of Glycemic Responses
http://www.cell.com/cell/abstract/S0092-8674(15)01481-6

There are rather interesting findings: current universal dietary plans recommended by nutritionists may not be effective for everyone; and machine learning can help us personalize effective plans based on personal features.

Hope in near future we can benefit from this technique.