By Kate Kelland LONDON (Reuters) – A third of people worldwide are either undernourished or overweight, driving increasing rates of disease and piling pressure on health services, a global report showed on Tuesday. Rates of obese or overweight people are rising in every region of the world, and in nearly every country, according to the 2016 Global Nutrition Report – an annual independent stock take of the state of the world’s nutrition. Malnutrition comes in many forms – including poor child growth and development and vulnerability to infection among those who do not get enough food, and obesity, heart disease, diabetes and cancer risks in people who are overweight or whose blood contains too much sugar, salt, fat or cholesterol.