Rick will need a diet limited in sugars, fats, saturated fats, carbs and protein.
Rick is going to need Veggies, Fiber, Natural sugar from fruits (Not fruit juices), Nuts, Seeds and Fish for protein and Whole grains for carbs.
An example of a healthy Diet for Rick would be:
Day 1.)
Breakfast; Raspberry Oatmeal
Snack; Banana, Nuts, Seeds or Carrots and Hummus
Lunch; Fish and Shrimp with Asparagus
Snack; Banana, Nuts, Seeds or Carrots and Hummus
Dinner; Bean and Kale salad drenched in Vinaigrette