How does Phentermine work?

First we need to discuss how losing weight works:

Your body needs a certain amount of calories to keep itself going, and if you eat more than that amount, you will gain weight. If you consume fewer calories than you expend, you will lose weight. It's that simple. Phentermine helps you consume less calories, leading to short and long term weight loss.

The equation described above is complicated by the fact that your body doesn't like you to eat less than it needs; it will think you are starving. If you go on a severely limited diet, your body will do a bunch of irritating things, such as: giving you hunger pangs, making you feel tired and sluggish, drawing the energy it needs from your muscle tissue as well as your fat, etc. Therefore, you shouldn't try to lose weight by dieting alone.

A pound of fat represents approximately 3500 calories of stored energy. In order to lose a pound of fat, you have to use 3500 more calories than you consume. It's best not to do this over the course of a day; you'd probably hurt yourself, and your body (knowing it, the uncooperative creature) would probably have some extreme reaction which did not involve you losing any actual weight. It's better to spread this out over a week, so that you aim to exceed your caloric requirements by 3500 to 7000 calories per week, resulting in weight loss of one to two pounds per week. It's not healthy to try to lose more than two pounds in a week, and if you do attempt to do so you're unlikely to be successful. Not sure how much weight you need to lose? Check a BMI calculator and a body fat calculator. Make it your goal to hit the right BMI and body fat percentage for your height.

Let's say you want to lose two pounds per week. To do so, you need to figure out how many calories a person of your age, sex, and weight usually needs in a day (see Eat Less), subtract 500 from that amount, and follow a diet that provides you with that many calories. For example, if you would ordinarily need 3000 calories in a day, you would follow a 2500 calorie per day diet. Then you figure out how much exercise a person of your weight would need to do to burn 500 calories per day (see Exercise), and you get off your lazy ass and do it. The result is simple. 500 fewer calories consumed plus (minus, actually, but we don't want to confuse you) 500 more calories expended equals a 1000 calorie per day deficit, which, over the course of a week adds up to 7000 calories, or two pounds. Your mileage may vary, but there's no getting around it. If your body is consuming fewer calories than it's expending, something's got to go (see God, "The First Law of Thermodynamics").

Phentermine works by stimulating the hypothalamus gland(The hypothalamus is the region of the brain that controls the autonomic nervous system, regulating sleep cycles, body temperature, appetite, etc.) and affecting certain neurotransmitters to decrease appetite, effectively decreasing the intake of calories necessary for you to lose weight.


Our brains are responsible for the normal functioning of our bodies. Parts of it produce various chemicals that help maintain bodily functions and keep the bodyís balance in check. These chemicals are known as neurotransmitters. These neurotransmitters are secreted by various glands in the brain and will affect the body depending on the concentration of these chemicals in the blood stream. Different chemicals as well as differing concentrations will have different effects. Such neurotransmitters are cathecolamines, norepinephrine, dopamine, epinephrine, serotonin, and GABA. Specifically, Phentermine works by stimulating the hypothalamus gland to produce more catechlamines which are responsible for the fight or flight response of the body.

Fight or Flight Response

This is the common response of the body under extreme stress or anxiety. For example when we are faced with a rabid animal, our instincts tell us to run as fast as we can and we are able to clear distances that we never thought possible. This is also the system that enables us to be alert when something stressful suddenly happens. This could happen even if you are extremely tired or even at night time. The primary function of Phentermine is to stimulate the bodyís normal response so as to lose weight.

Suppressing Appetite

But how exactly does phentermine work to suppress the appetite? You may have noticed that when we are in this so called fight or flight response, our body is capable of doing near superhuman feats such as running extremely fast or becoming suddenly alert and focused in the dead of the night. We also do not feel any need to eat during this time. Phentermine works by activating this response so as to suppress the appetite akin to being in a stressful situation. Therefore, we hardly feel any hunger pangs thus we do not have to eat. Another effect is that it forcibly increases metabolism and rate of energy expenditure as if we are readying to jump or run great distances. This will allow your body to burn of a lot of calories that will otherwise be stored as fat.

Phentermine merely mimics your body's natural response to stress and uses this to keep your hunger pangs at bay and also increases your ability to burn fat. Since it uses a normal reaction, it is safe and very much efficient and that is why it is one of the most popular weight control pills and supplements around.

So if you want to lose weight and you're not sure how to go about doing it, give us a call or come in and talk to our doctors to see if Phentermine is for you. For your safety we need to go over certain health issues to make sure phentermine is right for you. If so, you'll be on your way to achieving your ideal weight in just one office visit!

If you're looking for ways to support your current weight loss methods, or simply want to get started with losing weight We Will Help.

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