Weight Loss: Scientific Dietary Planning and Reasonable Meal Distribution for Easy Weight Control and Fat Reduction

Dietary Weight Loss

Section 1: Diet and Nutrition

Except for a very small number of cases caused by genetics and endocrine disorders, the vast majority of obesity is caused by excessive nutrient intake and insufficient physical activity, resulting in calorie intake exceeding calorie expenditure. Therefore, in addition to maintaining moderate physical exercise and manual labor, controlling overeating is crucial for the prevention and treatment of obesity. Dietary control for weight loss is easy to manage, saves time and money compared to other weight loss methods, and has no side effects, but it requires determination and perseverance.

I. The Current State of Dietary Structure in my country

(I) Ideal Dietary Structure The ideal dietary structure is a comprehensive concept, with different people having different understandings and requirements at different historical periods. Balanced and comprehensive nutrition is the foundation of the modern ideal dietary structure. It means ensuring the body's need for calories while avoiding physiological burden caused by an imbalance in dietary structure. The ancient Chinese medical classic, *Neijing*, states that "grains nourish, poultry benefit, fruits assist, and vegetables supplement," which is a model of balanced and comprehensive nutrition and forms the theoretical foundation of modern Chinese nutrition and the ideal dietary structure.

(II) Current Status of my country's Dietary Structure As early as the mid-1950s, Chinese nutritionists suggested to relevant national departments that by 1985, the average monthly intake of staple and non-staple foods per person nationwide should reach: 15 kg of grains, 8 kg of tubers, 1 kg of beans, 1 kg of meat, 0.5 kg of eggs, 0.5 kg of fish, 15 kg of vegetables, and 0.25 kg of vegetable oil. On this basis, appropriate amounts of dairy products, poultry, sugar, and fruits should be supplied. This standard has been largely achieved by urban residents nationwide. If supplied according to this standard, the average daily calorie intake per person could reach 2300 kcal.

The traditional dietary structure of the Chinese people is mainly a mixed dietary structure dominated by polysaccharides. In this dietary structure, grains provide 70-75% of the total calories. The protein and carbohydrates from grains are easily digested and absorbed, which is a major advantage. However, compared to the protein from meat and vegetable oils, the protein from grains is not only less nutritious but also provides less satiety and reduces hunger. Given my country's national conditions, it is not easy to achieve a high intake of protein from animal products in the short term. Based on my country's current situation and people's lifestyles, this can be alleviated through two channels: first, improving the nutritional value of staple foods; second, appropriately increasing the supply of legumes and their products. Legumes provide a high amount of protein, contain a large proportion of unsaturated fatty acids, and contain no cholesterol, only phytosterols, which have the effects of lowering cholesterol and preventing hypertension and coronary heart disease. Therefore, in areas where meat, milk, and eggs are insufficient, appropriately increasing the supply of legumes is the best solution to compensate for protein and fat deficiencies.

(III) Two Ratios of an Ideal Dietary Structure An ideal dietary structure includes two aspects: 1. The ratio of the three major nutrients: carbohydrates, fats, and proteins.

2. The Proportion of Calorie Distribution in Three Meals a Day.

There are various standards for the proportions of the three major nutrients: carbohydrates, fats, and proteins. The World Health Organization and the Food and Agriculture Organization of the United Nations (FAO) recommend 58% carbohydrates, 30% fats, and 12% protein. Nutritionists in the former Soviet Union advocated a proportion of 60%, 25%, and 15% for carbohydrates, fats, and proteins, respectively. Dr. Kenneth Cooper, director of the Texas Aerobics Center and a cardiovascular medicine expert, advocates a proportion of 50%, 30%, and 20% for carbohydrates, fats, and proteins. Experts in China believe that adolescents in puberty should appropriately increase their intake of foods high in protein, fat, and carbohydrates, with the following proportions: 60-70% carbohydrates, 20-30% fats, and 13-15% protein.

There are also various standards for the distribution of calories in three meals. Dr. Kenneth Cooper, an American medical doctor, recommends 25% for breakfast, 50% for lunch, and 25% for dinner. Nutritionists in some countries advocate for a balanced distribution of calories across three meals a day: 30% for breakfast, 40% for lunch, and 30% for dinner. Other nutritionists and medical experts recommend 30% for breakfast, 45-50% for lunch, and 20-25% for dinner. Still others suggest that over 70% of daily calories should be consumed in the first half of the day, during times of heightened mental activity, peak muscle metabolism, and highest calorie expenditure. An ancient Roman proverb states, "Breakfast for yourself; lunch for your friends; dinner for your enemies." my country also has a long-standing proverb, "Eat a good breakfast, a full lunch, and a light dinner," all emphasizing the proper distribution of calories across three meals. As early as 1947, the University of Milarepa Medical School in the United States conducted an experiment. Experts divided healthy, willing participants into two groups: Group A ate only breakfast, and Group B ate only dinner. Both groups consumed the same quantity and quality of food, with a total calorie intake of 2000 kcal. One week later, Group A lost an average of 0.8 kg, while Group B gained an average of 0.45 kg. The following week, the order was reversed: Group A switched to eating dinner, and Group B changed their breakfast. The result was that Group A gained an average of 0.35 kg, while Group B lost an average of 0.5 kg. The experimental results show that dinner leads to weight gain more than breakfast.

Eating a good breakfast is especially important for students of all ages and for manual laborers. Data shows that students of all ages require 50-60% of their total daily calorie needs in the morning. Schools typically have 3-4 classes in the morning, requiring students to actively think and consuming a significant amount of oxygen and energy. Although the brain only accounts for 1.5-2% of body weight, it consumes 30-35% of the body's total energy and 20-25% of its total oxygen. To ensure normal brain function, blood glucose levels must be maintained, and blood glucose levels decrease with prolonged mental activity. Using the blood glucose concentration per 100 ml of blood as a standard, after half an hour of mental exertion, the blood glucose concentration is 100-120 mg, at which point the brain's reaction is most agile and memory is strongest. After 1.5 hours of continuous mental exertion, the blood glucose concentration drops to 80-100 mg, at which point brain function is basically normal. After 2 hours of continuous mental exertion, the blood glucose concentration drops to 60 mg, at which point the brain's reaction is sluggish, thinking ability declines, memory is impaired, and symptoms such as dizziness, headache, and even loss of the ability to continue learning or working occur. After 4 hours of continuous mental exertion, the blood glucose concentration drops to 45 mg, at which point brain function becomes disordered, leading to confusion and even shock.

Some people skip breakfast, which is a very bad habit that must be corrected. In the morning, the body is in a fasting state, and liver glycogen reserves are at their lowest. Skipping or eating a small breakfast prolongs the fasting period, preventing the body from replenishing its essential energy. For healthy individuals, this can easily lead to hypoglycemia, causing discomfort such as hunger, fatigue, and dizziness. In severe cases, it can even lead to shock due to hypoglycemia.

Eating a substantial lunch is also important. It replenishes the calories consumed in the morning and stores energy for afternoon study, work, and physical activity. According to the law of conservation of energy, breakfast and lunch should be appropriately increased in quantity, with a higher proportion of animal protein and fat to ensure the body's energy needs are met.

Eating less in the evening refers to both a smaller quantity of food and a lighter, more easily digestible diet. The Tang Dynasty physician and health expert Sun Simiao included the line "Prevent nighttime drunkenness" in his book *Inscription on Nourishing Life*. In my country, folk rhymes such as "Eat less, sleep more comfortably" and "Eat more at dinner, and you'll feel the heels of your bed" are widely circulated, vividly illustrating the importance of a small, light dinner. After dinner, you shouldn't sit down immediately to study or watch TV; instead, you should engage in some light activity to aid digestion. Having 2-3 hours of activity time between dinner and bedtime is even more helpful for weight loss.