The ADA say low-carbohydrate diets can be useful to help people with type 2 diabetes lose weight, but that these diets were poorly defined, difficult to sustain, unsuitable for certain groups of people and that, for diet composition in general". Overall, the ADA recommends people with diabetes develop "healthy eating patterns rather than focusing on individual macronutrients, micronutrients, or single foods". They recommend that carbohydrates in a diet should come from whole food sources such as "vegetables, legumes, fruits, dairy (milk and yogurt), and whole grains"; highly refined foods and sugary drinks should be avoided.