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Nutrition is a science that studies how the bodies breaks food down and how it repairs and creates cells and tissue.A balanced diet is important because your organs and tissues need proper nutrition to work effectively. Without good nutrition, your body is more prone to disease, infection, fatigue, and poor performance. Children with a poor diet run the risk of growth and developmental problems and poor academic performance, and bad eating habits can persist for the rest of their life.Rising levels of obesity and diabetes in America are prime examples of the effects of a poor diet and a lack of exercise. Is essential to link up a good nutrition with daily exercise to be healthy and prevent food imbalances. Also, the lack of physical activity is another important factor related to obesity. Many people have jobs that involve sitting at a desk for most of the day. On the one hand bad eating habits have contributed to obesity in the world. Furthermore, a diet poor in nutrients is related to greater health risks that can produce important illness. Our decisions about what we eats affects you health and on how we feel in our daily life. A balanced diet has many benefits. People think that eating healthy can help to reduce or maintain weight. Eating well makes you feel more active and fit. Another benefit of eating well contributes to being more concentrated during different activities, don’t be tired and improve our changes of humour. But also, it reduces the risk of suffer serious diseases such as heart attacks, cancer, stroke or diabetes. The nutrients in the foods you eat support the activities of day-to-day living, protect your cells from environmental damage and repair any cellular damage that might occur. Obesity is not the only nutrition-related cause of disease onset and progression. Too much or too little of certain nutrients can also contribute to health issues. Obesity is a problem that takes place everywhere. However, America is the country where this problem abound, more than in any other. The reasons why obesity is an increasing problem are multiples. First of all, the food that in America are used to eat is above fast food.Another important reason is the lifestyle, specifically transport, because we always use different types of transport, like car, buses or trains for short distances instead of going walking. This is aggravated if we add the mass of sedentary jobs. In addition, we must also take into account the rhythm of life, which leads to a few hours of sleep and increases stress. Finally we must keep in mind the te mperatureincrease, which makes it more expensive to exercise.

On the other side, a consequence of bad eating habits takes place in developing countries, in which malnutrition is frequently due to some reasons such as poverty that is far from being eradicated. Poverty alone doesn’t lead to malnutrition, but it seriously affects the availability of adequate amounts of nutritious food for the most vulnerable populations. Another reason is the lack of access to food, this means that n on-availability of food in markets, difficult access to markets due to lack of transportation, and insufficient financial resources are all factors contributing to the food insecurity of the most vulnerable populations. People are increasingly dependent on international markets for all or part of their food supply, particularly between harvest periods. Many people are increasingly vulnerable due to fluctuations in the prices, as was recently illustrated during the global food crisis. Also, c ertain illnesses and infections, such as tuberculosis, measles, and diarrhoea are directly linked to acute malnutrition. A combination of disease and malnutrition weakens the metabolism creating a vicious cycle of infection and undernourishment, leading to vulnerability to illness. Furthenmore, conflicts have a direct impact on food security, drastically compromising access to food. Often forced to flee as violence escalates, people uprooted by conflict lose access to their farms and businesses, or other means of local food production and markets. Abandoned fields and farms no longer provide food to broader distribution circuits. The climate change is another cause of malnutrition in developing countries.In few years, the number of natural disasters such as droughts, cyclones or floods linked to climate change has increased substantially. The effects of climate change are often dramatic, devastating areas which are already vulnerable. Infrastructure is damaged or destroyed, diseases spread quickly, people can no longer grow crops or raise livestock. Finally, the lack of potable water,poor sanitation, and dangerous hygiene practices increase vulnerability to infectious and water-borne diseases, which are direct causes of acute malnutrition. One of the main causes of malnutrition in developing countries is the general simplification of diets, which are based mainly on refined carbohydrates (from wheat, rice and sugar), processed fats and oils. These foods have displaced, neglected and relegated to oblivion traditional and indigenous foods, which are generally more nutritious. Different nutritional disorders may arise, depending on what nutrients are under or overused in the diet. The World Health Organizati on defines Malnutrition as the greatest individual threatto world public health.

To improve this situation we propose two ways to improvement. First of all we think that the obesity can be attacked if we work to change the fast food into the mediterranean diet, whichi is considered the best one. The food that compose this diet are:
 * Cereals
 * Fruit and vegetables
 * Water
 * Milk and yogurt
 * Olive Oil
 * Meat and fish

Besides this there are different measures that we propose to improve the situation of malnutrición in the poor countries.
 * To promote the mother lactation
 * To provide nutritional supplement
 * Increased aid.
 * To provide vitamins

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