Brain Facts:
Diet

Healthy Diet

A healthy diet can have a major impact on life expectancy by lowering our risk for heart disease, cancer and other age-related illness. Longitudinal studies have found that a diet that emphasizes the right food choices and helps people stay at their target body weight can increase survival rates by 50 percent or more.

Leptin

Your brain uses several indicators to keep track of your body’s energy needs. A hormone called leptin is produces by fat cells and release in the blood. Leptin tells the brain not only how much fat is present in the body but also how fat levels are changing. When your body fat decreases, leptin levels in the blood fall sharply, telling your brain that the body needs more energy. These declining leptin levels trigger hunger and weight gain. In contrast, when leptin levels increase, animals reduce their food intake and lose weight, and people report being less hungry.

Leptin is a good measure of subcutaneous fat, while insulin is related the amount of visceral fat, which is a more significant risk factor for diabetes, hypertension, cardiovascular disease, and may cancers.

Nutrients
—Brain Cells

New research shows that nutrients, including glucose and fat, can have an almost immediate impact on brain cells and brain functioning, producing rapid changes in mood and monumental changes in long-term behavior.

Nutrients
—Neurotransmitters

The type of neurotransmitters and your neurons make and release and their ultimate destiny within the brain depends greatly on what you eat. Obviously, that makes food a very big regulator of the brain.

Quote
—Orson Wells

My doctor told me to stop having intimate dinners for four—unless there are three other people.

Weight
—Brain Set Point

Because weight regulation is so important, multiple overlapping systems work toward keeping your weight at a level that your brain considers appropriate, which is sometimes call your “set point.” For example, scientists know of more than a dozen neurotransmitter that tell the body to increase weight, and more than a dozen that tell the body to decrease weight. When you try to change your weight by eating less, your brain falls back on tricks to keep your weight at its preferred level. One is to decrease your resting metabolic rate, which is the amount of energy that you use when sitting. Another is to make you hungry, so that you’ll want to eat more.

Weight
—Diet

Your metabolic rate determines how many calories your body burns at rest. Severely low-calorie diets never work in the long run because the very real risk of starvation in our evolutionary past has produced brains that are expert oat protecting the body for severe weight loss.

Weight
—Ghrelin Horemone

Neurons in the hypothalamus and the brainstem also monitor available energy sources to control food intake. For example, fatty acids and a hormone called peptide YY seem to act directly on neurons to reduce eating, while the hormone ghrelin is released around the mealtime to increase hunger and eating.

Weight
—Insulin

Insulin is another important signal that tells your brain how much stored body fat is available. Produced by the pancreas after meals, it is released into the blood to tell a variety of cells to take up glucose from the blood and store the energy.

Leptin is a good measure of subcutaneous fat, while insulin is related the amount of visceral fat, which is a more significant risk factor for diabetes, hypertension, cardiovascular disease, and may cancers.

Weight
—Leptin

Your brain uses several indicators to keep track of your body’s energy needs. A hormone called leptin is produces by fat cells and release in the blood. Leptin tells the brain not only how much fat is present in the body but also how fat levels are changing. When your body fat decreases, leptin levels in the blood fall sharply, telling your brain that the body needs more energy. These declining leptin levels trigger hunger and weight gain. In contrast, when leptin levels increase, animals reduce their food intake and lose weight, and people report being less hungry.

Weight
—Leptin Receptors

Leptin receptors in the brain are found in the arcuate nucleus of the hypothalamus, a part of the brain that is an important regulator of many basic systems, including body temperature and sexual behavior. Leptin also acts at other sites in the brain and elsewhere in the body, influencing metabolism and other regulators of fat storage.

Weight
—Leptin Resistance

Many overweight people already have high levels of leptin in their bloodstream but don’t respond normally to the hormone, showing what scientist call “leptin resistance.” In most people leptin resistance is a consequence of obesity. This leptin resistance is similar to insulin resistance, which is triggered by weight problems and is the cause of adult-onset diabetes. Obesity caused by overeating causes leptin to become less effective at  activating signals that instruct the arcuate nucleus to reduce the body’s weight.