> diabetes

This scales principally with excess weight gain.

> The fact is meat is often the central peace of the dish, second the carbs and then salads, cabbages and roots.

This is one meal, dinner, and the fact that it is more protein-heavy is not the problem. Nevermind ratio, some diets are devoid of fiber. The secondary "carbs" are just pasta, white bread, crackers, etc.

If you consume a whole-foods diet, with a dinner that has a larger meat component, you will easily, easily have enough fiber.