Red Light Therapy for Weight Loss: The Science Behind Fat Loss Support
We aren’t making any claims in this article; we are simply sharing research.
Does Red Light Therapy Support Weight Loss?
Red light therapy can be incredibly helpful in so many different ways, but can red light therapy be effective for weight loss? Let’s take a look at the studies available to see if the research supports it.
So how exactly does red light therapy work for weight loss?
At its core, the fat-loss effect appears to stem from an increase in cellular energy production and metabolic activity, thus helping the body reduce fat without directly destroying fat cells. This process is driven by stimulation of the mitochondria, encouraging greater production of adenosinetriphosphate (ATP), the cell’s primary energy currency. With more energy available at the cellular level, overall metabolic function is enhanced.
Research suggests that, when paired with exercise—or even more effectively, a consistent caloric deficit—red light therapy can contribute to measurable reductions in waist circumference and overall body fat. Studies show that it increases the permeability of fat cell membranes, allowing stored triglycerides to be released and subsequently used by the body for energy.
Additionally, red light therapy may support reductions insystemic inflammation, a factor commonly linked to obesity and metabolic dysfunction, further contributing to improved metabolic health over time.
A 2025 study published in Nutrients titled, “Photobiomodulation Acutely Augments Resting Metabolism in Women with Obesity” explored how PBM affects energy expenditure at rest. The researchers found that photobiomodulation therapy produced an immediate increase in resting metabolic rate in women with obesity, suggesting that light therapy may temporarily elevate the body’s baseline energy burn. While this doesn’t replace foundational strategies like nutrition and exercise, it highlights a compelling mechanism: PBM may help “turn up the dial” on metabolism, potentially supporting fat loss efforts when combined with a caloric deficit and lifestyle interventions. (1)
Next, a 2025 study investigated the immediate effects of photobiomodulation on metabolism in women with obesity. The findings showed that a single PBM session was able to acutely increase resting metabolic rate, indicating a short-term boost in energy expenditure even without physical activity. This supports the idea that light therapy may enhance metabolic efficiency at a cellular level, offering a promising complementary tool for weight management when paired with foundational strategies like proper nutrition and exercise. (2)
Can red light therapy help you to lose weight in localized areas?
Lately, there’s been growing interest in whether red light therapy can lead to localized fat loss. Some individuals have even reported, anecdotally, reductions in facial fat after using it.
Beyond that, many people are curious about its potential effects on specific areas of the body, such as abdominal fat. One study investigating this question included 40 healthy adult participants under the age of 65 (3).
In this study, participants received treatment to the waist area for 30 minutes per session, twice per week.
The results suggested reductions in waist circumference of approximately 0.4–0.5 centimeters per treatment. Elsewhere in the paper, the authors reported a total average reduction of about 2.15 centimeters, which introduces some inconsistency in how the outcomes were presented.
It’s also worth noting that the statistical analysis included only participants whose body weight fluctuated by more than 1.5 kilograms, which may influence how the results should be interpreted. Overall, while the findings are interesting and suggest a potential effect, they should be viewed with some caution and considered within the context of the study’s design.
Participants completed a total of eight treatment sessions over a four-week period. To assess cosmetic outcomes, researchers also evaluated photographs taken throughout the study. This evaluation was conducted in a blind manner, meaning the reviewers did not know which images belonged to the control group or the treatment group. After four weeks, the images from the treatment group were rated as showing improved cosmetic appearance.
The researchers also explored possible mechanisms that may explain the observed fat loss (4). Findings from laboratory (in vitro) studies suggest that light therapy does not directly destroy fat cells. Instead, the authors outlined several alternative processes that may contribute to reductions in fat, including:
"The number of viable cells in the laser-treated or untreated group as determined by the propidium iodide assay were similar, but calcein levels were lower in the laser-treated cells [...]. Calcein, a non-fluorescent dye, gets transported through the cell membrane, becomes fluorescent due to cleavage with cellular esterases, and gets trapped intracellularly. Normally functioning cells can extrude the entrapped dye. Considering the equal cell viability in the two groups, lower calcein levels in the laser-treated group suggest either intact metabolic functioning of cells and/or reduction of cell-trapped calcein, perhaps by leakage." (4).
For better understanding, this statement means that fat is emitted from the cells and then it’s burned off.
It’s also important to note that the participants in this study were not classified as obese. In general, individuals who are over weight or obese may experience more noticeable changes earlier in a weight loss process, so results could differ in those populations.
While this next study mentions significant girth loss averages from the waists of 40 participants, it doesn’t mention whether they noticed a difference in overall weight loss of other parts of the body. But we can still take it as an overall win for weight loss using LLLT.
A clinical study by Caruso-Davis et al., published in Obesity Surgery, evaluated the effectiveness of low-level laser therapy(LLLT) for body contouring and localized fat reduction. The researchers found that participants experienced safe and statistically significant reductions in waist circumference, with results becoming more pronounced over a series of treatments across four weeks. The protocol used was LLLT for 30 minutes per session, twice a week for four weeks. Notably, the reduction in girth translated into visible cosmetic improvements, suggesting that LLLT may support targeted fat loss by promoting measurable changes in body shape when used consistently.
The only issue that I find with this study is that other areas of the body weren’t measured to see if the weight loss was indeed targeted or if in fact the weight loss occurred in other areas of the body as well. It’s also important to note that the subjects weren’t asked to change their exercise or dieting habits. (5)
System Fat Loss and Red Light Therapy
Let’s take a look at a study not focusing on localized weight loss but overall weight loss using PBMT.
A study found that women with obesity experienced roughly twice the amount of weight loss when combining exercise with light therapy compared to using light therapy alone.
The researchers outlined the treatment protocol as follows:
"The application of Phototherapy by Continuous Laserwaves (808 nm) occurs always at the end of the training session. Thus, in each week, the patients received three sessions of phototherapy. The emitters were arranged perpendicularly to the skin and were allocated in the anterior region: abdominal and quadriceps simultaneously during 8 minutes. After this, change the position to irradiate the posterior region: gluteus and biceps femoral during 8 minutes, totalizing 16 minutes" (6).
In this study, treatment was applied to the trunk and lower body, both front and back. The exercise program included 30 minutes of aerobic activity along with 30 minutes of resistance training. Participants who received 808 nm light therapy lost an average of 11.2 kilograms (24.6 pounds), while those in the comparison group lost about 5.8 kilograms (12.8 pounds), representing a substantial difference.
Measures of insulin resistance, assessed using the HOMA-IR index, also improved more in the light therapy group, with a reduction of 38 points compared to 21 points in the placebo group. Additionally, participants receiving light therapy gained an average of 0.6 kilograms of muscle mass, whereas the comparison group experienced a loss of about 1.4 kilograms.
Overall, these findings suggest that 808 nm light therapy, when combined with exercise, may offer meaningful support for fat loss and broader metabolic health outcomes.
But if Light Therapy works so well for fat loss, does exercise even matter?
Great question!
A 2017 study by Kim et al., published in Journal of Physical Therapy Science, examined whether applying near-infrared light to the abdominal area during treadmill walking could enhance fat loss outcomes. The researchers found that participants who combined exercise with near-infrared light therapy experienced greater reductions in abdominal fat and body weight compared to exercise alone. These findings suggest that photobiomodulation may amplify the effects of physical activity, potentially supporting more efficient reductions in localized adiposity when used alongside consistent exercise. (7)
A comparative study in 2021 by Aquino Junior et al. explored the effects of adding photobiomodulation to a standard weight loss program of exercise and nutrition. The researchers found that participants who incorporated 808 nm PBM alongside these lifestyle interventions experienced significantly greater reductions in both body weight and fat mass compared to those following exercise and nutrition alone. These findings suggest that photobiomodulation may act as a powerful adjunct, enhancing the body’s response to traditional fat loss strategies and helping accelerate measurable results. (8)
So, it looks like light therapy is a great tool for fat loss but combined with a proper diet and exercise, its effects are even greater! Wow!
Is Red Light Therapy Safe For Weight Loss?
Looking at the research, the answer seems to be yes. Individual results can vary, and factors like incorrect dosing or inconsistent use or other factors such as poor quality diet may influence outcomes. Overall, red light therapy is generally considered safe, and its broader effects may support overall health and potentially contribute to a reduced risk of disease.
A study by Martins et al., published in Lasers in Medical Science, investigated the effects of low-level laser therapy at 660 nm and 808nm on abdominal fat tissue. The researchers found that treatment with red light at a dose of 5 J/cm² stimulated lipolysis, meaning fat cells released storedlipids, without negatively impacting liver function or other key safety markers. These findings are important because they suggest that PBM can promote fat metabolism at the local tissue level while maintaining a strong safety profile, supporting its role as a targeted and non-invasive approach to fat reduction. (9)
Next up is a randomized trial by Elsayed et al., published in Scientific Reports in 2023, examining the effects of combining exercise with PBMT in older adults with obesity. Over 12 weeks, participants who received both treadmill training and PBMT showed significantly greater improvements in body weight, BMI, and waist-to-hip ratio compared to exercise alone. In addition, the combination group demonstrated meaningful reductions in cholesterol, inflammation markers like CRP, and indicators related to blood clotting risk, all without reported adverse effects. These findings suggest that photobiomodulation may not only enhance fat loss outcomes but also improve broader metabolic and cardiovascular health when paired with consistent exercise. (10)
So it looks like the research is telling us that not only is light therapy effective for fat loss but it’s also safe (within reason, always check with your doctor first) and helps to promote improved health in other ways as well.
A better understanding:
Now that the research is showing that light therapy can help with fat loss, how would we know which device to use and why?
Let’s start with wavelengths. Based on the research we can concede that the wavelengths with the most positive outcomes in most cases are 660nm and 808nm/810nm. From previous research mentioned in our other blogs we have learned that research shows us that using both red and near-infrared together tends to be ideal. Combining the two regions of the spectrum likely offers complementary advantages at the mitochondrial level.
It's good to note that no full-body studies have been carried out and that we see many spot treatments. It’s also good to know that fat cells want to come to an equilibrium so trying to only eliminate fat cells in a specified area would seem to be a lost cause.
Fat loss doesn’t behave like a spotlight—it functions more like a whole-body energy shift. When the body mobilizes fat for energy, it does so systemically, not from one isolated area. This is because fat cells are regulated by complex hormonal and metabolic signals, all working to maintain balance, or equilibrium, across the body. Even when a specific area is targeted with an intervention, fat is not selectively removed from just that region. Genetics further influence where fat is stored and lost, meaning some areas will naturally respond faster than others.
This principle is important when considering photobiomodulation (PBM) for fat loss. While light therapy may support processes like lipolysis (the release of stored fat from fat cells), the body ultimately determines how and where that energy is used. Research continues to reinforce that localized fat reduction is limited. For example, a selection of multiple peer-reviewed research studies found that targeting specific areas does not significantly reduce fat in those exact locations, confirming that fat loss occurs across the body rather than in one precise spot.
Next, Red light therapy isn’t a miracle cure. You must still lead a healthy lifestyle by eating the food that your body needs. If you think you can eat whatever you want all day and then use red light therapy to lose weight, you’re mistaken. Healthy lifestyle choices are needed and red light therapy will help to aid in the weight loss process, essentially speeding up the amount of fat you lose in a specified amount of time.
In Conclusion,
When you zoom out and look at the full body of research, a clear picture begins to form: photobiomodulation isn’t a magic shortcut for fat loss, but it does act like a powerful amplifier. It supports fat metabolism, enhances energy production, and even helps you recover faster from exercise, making it easier to stay consistent, which is where real results are built. And while device size often gets the spotlight, the science points elsewhere. What truly matters are the right wavelengths and sufficient power output, not just coverage area. Whether using a full panel or a targeted device like the LZR Ultrabright, the goal is delivering clinically relevant light where it counts.
That’s where the LZR Ultrabright quietly stands out. By utilizing both 660 nm red and 810 nm infrared wavelengths, frequently highlighted in the research, it aligns with what the literature supports most. Even more practically, its 30-second treatment time removes one of the biggest barriers in any weight loss journey: consistency. While many devices require lengthy sessions that can derail routines, this approach fits seamlessly into daily life, helping users stay on track. In the end, PBM works best when paired with the fundamentals: nutrition, movement, and discipline but with the right tools, it can help turn steady effort into noticeably more efficient progress.