Calorie-Content of Fats is over-valued
The calorie value of fats is over-stated because fats, particularly in huge amounts in the diet, may not be totally burned to carbon dioxide and water. Aside they oxidize partly and produce ketones (like charcoal that remains when wood is not totally burned to ashes). Until our kidneys get rid of them, ketones contain appetite. This is why fats are used in some weight loss diets. However, it is possible that the long term presence of ketones from such diets can harm our kidneys and liver, so be careful in using this type of high fat weight loss plan.
Not All Food Calories Used For Energy making
Essential fatty acids (EFAs) include 9 calories per gram, but our body consumes them for structural, hormonal and electrical functions rather than for energy. At high levels of ingestion, EFAs increase metabolic rate and increase fat burn off, resulting in loss of weight.
We Burn Calories at Different Rates
Metabolic rate be different from one person to another, from one time to another in the same individual and differ with the total nutrient mix. Genes, hormones, nutrition, exercise and state of health all affect metabolic rate. Other people are born with a high metabolic rate and never gain weight no matter how much they eat. Thyroid activity affects metabolic rate over a wide range. The slower the rate, the a smaller amount calories are burned and the easier it is to gain weight.
Health status have an effect on Calorie-Burning
The state of our health change our metabolic rate. If we fevers and infections, much more energy is burned than when a person is healthy. In late stages of cancer, tumors eat most of the body’s stores of energy resulting in loss of weight. Stress increases the body’s fat burning rate. Some people lose 10 pounds in just a few days of serious worry. Other stresses also stimulate the body’s fat burning mechanisms.
Extra Mental Activity burns Extra Calories
The span of time per day spent awake makes a difference as we burn more calories when we are awake than when we are sleeping. The level of mental activity affects the use of calories. Our brain, although it is only 2 percent of the body’s weight uses 20 percent or more of total calories burned by our body.
Environment Affects Calorie Usage
Environmental conditions effect the rate at which calories are used. Our body responds to changes in temperature, season and climate, raising metabolic rate to keep body temperature constant. Clothing conserves more or less calories, depending on what it is made from, how thick it is and how much of our body we cover with it. Our body loses more heat swimming in cold water than when surrounded by air of the same temperature, because air conducts body heat away less rapidly. Shivering also increases fat burning.
Hunger and satiation factors also influence whether the foods we eat keep us fit or fat. Different foods are digested, absorbed into our body, and made available for use at different
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