How to gain weight the healthy way
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You should try to get her to a Registered Dietician.
You can stay within your practice by encouraging her to eat real food (such as whole grains, fresh fruits and veggies) and teach her to read food labels. Emphasize that a product that claims to be “natural”, “gluten free”, “low carb” or “paleo” among many other misleading labels are not necessarily healthy at all. Teach her to read the back of the label so she knows what a serving size is, and exactly what the food contains. Also, the healthiest foods will probably not have labels at all!