In life, there are two categories of people:those who have a "healthy" relationship with food (who like to eat but know how to control themselves completely) and... the others, those who, as soon as the meal is finished, are already to think about the next one and must force themselves to resist the temptation to have a small snack in the morning and/or afternoon. Always hungry, does that speak to you? Shona Wilkinson, who runs nutrition center NutriCentre, gave 5 explanations to Metro UK .