Of the more than 7.4 billion people living in the world today, nearly suffer from malnutrition.

Of the more that 7.4 billion people living in the world today nearly A BILLION PEOPLE suffer from malnutrition. 
Malnutrition refers to lack of proper nutrition, it may be as a result of not having enough to eat or eating meals that lack necessary nutrients. Malnutrition is principally caused by poverty and a lot of people, especially from developing countries suffer from this condition. Malnutrition weakens body immunity and make the body susceptible to diseases.

They must use the scientific method