Understand what metabolism is
In the simplest terms, metabolism is the rate at which your body burns calories. The rate differs significantly from person to person. You and your friend can have the same activity level, diet, and weight but still gain or lose weight at different rates based on differences in metabolism.
Determine what is influencing your metabolism
There are some factors that you can change, and some factors that you can't.
Age - metabolism slows 5% per decade after age 40
Sex - men generally burn calories faster than women
Heredity - you can inherit your metabolic rate from previous generations
Thyroid disorder - problems in the thyroid gland can slow or quicken metabolism but this is rare
Proportion of lean body mass - metabolism increases with muscle mass
Calculate your resting metabolic rate (RMR). RMR is often used interchangeably with basal metabolic rate (BMR); although they are slightly different, estimating either is sufficient for the purpose of losing weight. To calculate your RMR, use the Mifflin-St Jeor equation (which is more reliable than the Harris-Benedict equation). There are also calculators online that can do this for you:
RMR = 9.99w + 6.25s - 4.92a + 166g-161
w = weight in kilograms; if you know your weight in pounds, divide by 2.2 to get your weight inkilograms
s = height in centimeters; if you know your height in inches, multiply by 2.54 to get your height in centimeters
a = age in years
g = gender = 1 for males, 0 for females
Adjust your diet accordingly. Your RMR will tell you how many calories you need to maintain your body at rest. Your daily consumption to maintain your weight should be:
RMR x 1.15
E.g. RMR = 2000, so the maintenance intake is 2000 x 1.15 = 2300
To lose weight safely, consume no more than your maintenance intake but no less than your RMR.
Count calories by recording what you eat and looking up how many calories each food item contains (either on the food packaging or in tables provided in books or online).
Eat small, frequent meals. Extending the time between meals makes your body go into "starvation mode", which means it'll hold onto as many calories as possible and store them as fat. This is why fasting and skipping meals will only make things worse. In addition to having four to six small meals per day eating healthy snacks will also increase metabolism.
Drink water. As with food, depriving your body of water can encourage it to "hoard" rather than "burn". In order to encourage your liver to focus on metabolism rather than water retention, make sure you drink an appropriate amount of water.
Boost metabolism temporarily with aerobic exercise. Different activities burn different quantities of calories, but the important thing is to raise your heart rate and sustain the activity for approximately 30 minutes. Boost metabolism in the long run with weight training. Muscle burns more calories than fat (73 more calories per kilogram per day, to be exact) so the more muscle you build, the higher your resting metabolic rate (RMR). Every bit of muscle that you gain is like a little factory that burns calories for you 24 hours a day, 7 days a week. This is the only way to increase RMR, which accounts for 60 to 70 percent of the calories you burn daily.
TIPS to increase metabolism
There are no "fat-burning" foods. You might've heard that certain foods (like celery and grapefruit) increase metabolism, but it's just a myth. While some foods and drinks like red peppers and green tea have been studied for their potential metabolism-increasing properties, there is no conclusive evidence that whatever influence they have on metabolism is significant enough to result in weight loss.
However, some believe that certain extremely low-calorie foods, such as celery, cause the body to burn more calories in the act of consumption than are absorbed by the body. Still, half an hour walking will burn many more calories than half an hour of chewing celery.
Sugar-addicts diets will similarly tell you to not even use sugar substitutes as they cause the body to expect more energy and wrongly adjust accordingly.
Very low carb diets are said to burn more calories because the body spends time and energy in a system of changing fats, cholesterol and proteins into glucose, when you eat no significant amount of carbs.
That system is called the "krebs-cycle" or "tricarboxylic acid cycle," and it is necessary because the human body uses several forms of glucose for all energy requirements, all the time, even when you do not consume carbs. Krebs is also called the "Citric Acid Cycle." It is found in aerobic metabolism: this is the breakdown of proteins, fats and carbohydrates from food eaten to create the energy pathway at the cellular, mitochondria level.
If you try the lo-carb approach be sure to take multi-vitamins and essential oils, omega-3 and drink eight 8-oz. glasses of non-carbonated water (including tea and coffee) per day.
Cheese vs. Milk: Some real cheddar cheeses have nearly zero carbs, but most low-fat and fat-free milk products have lots of sugar. Read the labels.
Always consult a dietician or doctor before making a major change in your diet and exercise routine
Avoid smoking as a weight-loss method. While nicotine is a metabolism booster and appetite suppressant, the health hazards far outweigh any benefits.
Expect your metabolism to slow down as you lose weight. The more weight your body is carrying, the more calories your body has to burn in order to sustain itself, even at rest. When you begin restricting your calorie intake, you'll lose weight relatively easily because your body's high caloric needs are not being met. But after you begin to shed the weight, the body has less mass to carry and thus needs fewer calories. In order to continue losing weight, you will have to restrict your caloric intake even further in order to maintain a difference between what your body needs and what you are providing. Let's go through a hypothetical example:
You are 200 lbs and your body needs 2500 calories a day to sustain itself.
You cut down your caloric intake to 2000 calories.
You lose 25 lbs. Now your body only needs 2250 calories to sustain itself because it's carrying less weight.
If you continue with your 2000 calorie per day diet (the diet that helped you lose the first 25 lbs) you will still be losing, but at half the speed. In order to maintain a steady weight loss you will need to reduce your caloric intake further. However, it is at the utmost importance you do not try to consume fewer calories than your RMR!
Another possible problem:
If you continue with your 2000 calorie per day diet (the diet that helped you lose the first 25 lbs) you may actually gain weight back because of varying levels of exercise. Let's say you lose 50 lbs. on your 2000 calorie diet. Your sustaining calories might be 1800. You're actually consuming enough calories to gain weight, but how would that happen if you had stayed to your diet. This can happen when your exercise has burned through many calories. If you slowed on exercise at this point you would actually gain weight again. The point here is to recheck your RMR when you lose weight and compare it to your consumption.
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