L-Theanine And Weight Loss: What You Need To Know

Written by David G Kiely
FactChecked by No medical reviewer assigned.

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Weight is one of the major body issues that most people face in their lives, and all people want a slim body-like model irrespective of knowing their body type and their health concerns. Instead of promoting muscle gain, increasing metabolism, and accepting a healthy lifestyle, losing weight is always number one in our society.

As per medical science, L-theanine is an amino acid, and the intake of the same helps in the growth of body organs. The best part of L-Theanine is its occurrence, i.e., from tea leaves, so consumption of the same becomes completely safe. It helps in improving focus and attention, reducing stress and anxiety, enhancing sleep quality, increasing mood, increasing motivation, and, most importantly, helping in increasing memory as well. 

Most of the studies show that L-theanine has major effects on the central nervous system (CNS), which is why it boosts many cognitive functions, but does L-theanine also helps with weight loss is still a question. Let’s see the science behind this! 

Does L-Theanine Help With Weight Loss?

Many government websites claim that there is recent research on mice and L-theanine in which they administrate L-theanine in mice; it is proved that L-theanine helps in reducing fat growth in mice. L-theanine activates the browning of subcutaneous white adipose tissue (WAT), which stores the excess energy, and browning of WAT occurs when WAT cells become more like brown adipose tissue, which is responsible for burning calories in the form of heat. 

Benefits Of Weight Loss

L-theanine is present in the tea leaves, which is why it has some benefits in boosting metabolism and speeding up weight loss; there are many other psychological effects that also promote weight loss, such as:

1]  Manage Craving 

Most of the extra calories you eat are because of carvings and stress eating, basically when your stomach is full, but your mind signals you to eat something tasty. It has been shown that l-theanine raises gamma-aminobutyric acid (GABA) levels, a neurotransmitter that suppresses appetite. Additionally, it has been proven that L-theanine raises glutamine levels, an amino acid that has been observed to reduce appetite or cravings. 

2] Improving Fat Burning

By activating brown adipose tissue (BAT), L-theanine may boost the body’s capacity to burn fat. Compared to white adipose tissue (WAT), the type of fat that is normally stored around the abdomen and thighs, brown adipose tissue (BAT) is more metabolically active and produces heat.

3] Improving Insulin Sensitivity 

Many research suggests that L-theanine enhances insulin sensitivity, which may lower blood sugar level and encourages fat reduction. A hormone called insulin promotes the body’s use of glucose as energy. Weight gain may result from the body’s reduced ability to utilise glucose when insulin sensitivity is reduced. 

Using L-Theanine for Weight Loss: Benefits and Side Effects

L-theanine is available as a supplement in capsule or powder form. It is also found in green tea, but the amount of L-theanine in green tea can vary according to the amount and type of serving. The recommended dosage of L-theanine for weight loss is 200-400 mg; you can take it between meals or before going to bed as well. 

It is generally safe for everyone to take in a manageable way, but sometimes it can cause stomach upset, headache, dizziness, etc. It is always recommended to start using L-theanine after consulting with your doctor because if you are on any medication like sedatives or antidepressants, antidepressant then it can react with these things to do major negative effects on the body. 

Some additional tips for using L-theanine for weight loss 

  • For best results, use L-theanine together with a balanced diet and regular exercise. 
  • For best results, take it at least half an hour before having your meal.
  • Do not take it with coffee because caffeine can decrease its effects.  

In Summary 

L-theanine is a natural amino acid that can be beneficial for weight loss apart from its other health benefits. It works by managing caving or appetite, improving the burning fat mechanism, and improving insulin sensitivity. 

While more research is needed to validate L-theanine’s long-term benefits on weight loss and identify the ideal dosage, preliminary findings are encouraging.

If you are still interested in taking L-theanine supplements for weight loss, then before that, you must consult your doctor, especially if you have any health conditions or are taking any medications.

Dr. David G Kiely is a renowned Consultant Respiratory Physician and Director of the Sheffield Pulmonary Vascular Disease Unit. His expertise lies in pulmonary circulation and Connective Tissue Disease. Dr. Kiely is a leader in respiratory medicine, known for his prolific authorship and dedication to advancing the field. As Director, he has transformed the Sheffield Pulmonary Vascular Disease Unit into a hub for cutting-edge research and patient care.

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