The solution to hunger is complex but can include having ample nutritious food intake per individual. The amount to increase by depends on how much food is needed to carry out day-to-day tasks and to optimize body systems. Some challenges that this solution faces are: having enough money to afford the cost of food, having the food supply, and having a sufficient supply of nutritional foods. Also, having the education on what foods to buy and which are nutritional can be an issue (nutrition literacy). These are all factors that can cause a food policy to fail.