Does Phentermine Burn Fat or Just Suppress Appetite?

  • By: dr thushankas
  • Date: August 23, 2023
  • Time to read: 3 min.

Phentermine is a weight loss medication that has gained popularity in recent years due to its effectiveness in aiding weight loss. However, there is a common question among individuals seeking to use phentermine for weight loss: Does phentermine burn fat or just suppress appetite?

In this article, we will explore the mechanism of action of phentermine and examine whether it primarily burns fat or just suppresses appetite.

By the end of this article, readers will have a deeper understanding of how phentermine works and how it can contribute to weight loss.

Key Takeaways:

  • Phentermine is a weight loss medication.
  • There is a common question about whether phentermine burns fat or just suppresses appetite.
  • In this article, we will explore the mechanism of action of phentermine to see whether it primarily burns fat or just suppresses appetite.

How Phentermine Works

Phentermine works in the body by stimulating the release of neurotransmitters, particularly norepinephrine, dopamine, and serotonin. These neurotransmitters help suppress appetite and increase feelings of satiety, leading to a reduced caloric intake.

The stimulation of norepinephrine also leads to an increase in thermogenesis, which is the body’s process of generating heat and burning calories. This can result in a boost to the metabolism and potentially contribute to fat loss.

However, it’s important to note that the primary action of Phentermine is appetite suppression, and any fat-burning effects may be secondary to this mechanism of action. Additionally, the long-term effects of Phentermine on metabolism and weight loss are still being studied and are not yet fully understood.

Phentermine’s Fat Burning Properties

While Phentermine is primarily known for its appetite suppressant abilities, there is some evidence to suggest that it may also have fat-burning properties.

In a study published in the International Journal of Obesity, researchers found that Phentermine users experienced a greater reduction in body fat compared to a placebo group. However, the authors noted that the weight loss was likely due to a combination of reduced caloric intake and increased physical activity, rather than direct fat-burning effects of Phentermine.

Phentermine is believed to work by increasing levels of norepinephrine, a hormone that activates the “fight or flight” response in the body. This stimulation can lead to an increase in metabolic rate, which may contribute to fat loss.

It is important to note, however, that Phentermine should not be seen as a magic fat-burning pill. Proper diet and exercise are still essential components of any weight loss journey, and Phentermine should only be used as directed by a healthcare provider.

Appetite Suppression with Phentermine

While Phentermine is often lauded for its appetite suppressing effects, it is important to understand how this mechanism contributes to weight loss.

When taken as prescribed, Phentermine activates the release of norepinephrine in the brain, which in turn reduces feelings of hunger. By curbing appetite, individuals are able to consume fewer calories and create a calorie deficit, which can lead to weight loss.

A study published in the journal Obesity Research found that individuals using Phentermine for 12 weeks experienced a significant reduction in appetite and an overall decrease in body weight compared to a control group. Another study published in the New England Journal of Medicine reported similar findings, with Phentermine users experiencing greater weight loss than those taking a placebo.

It is worth noting that Phentermine should not be relied upon as a sole weight loss solution. Instead, it should be used in conjunction with a healthy diet and exercise regimen to achieve sustainable weight loss results.


In conclusion, Phentermine is an effective weight loss medication that primarily works by suppressing appetite. While there is some evidence that Phentermine may have direct fat-burning properties, its main action is reducing caloric intake by controlling cravings and portion sizes.

Overall, Phentermine can be a useful tool for individuals looking to lose weight. However, it should not be used as a long-term solution and should only be taken under the guidance of a healthcare professional. Proper diet and exercise should also be incorporated to achieve sustainable weight loss.

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