Studies show that caffeine can increase RMR by 3–11%, with larger doses having a greater effect. Interestingly, most of the increase in metabolism is caused by an increase in fat burning.
caffeine/coffee stimulates the metabolic rate in both control and obese individuals; however, this is accompanied by greater oxidation of fat in normal weight subjects.
https://pubmed.ncbi.nlm.nih.gov/7369170/
Further research has also suggested that caffeine may act as an appetite suppressant, leading to a decrease in food intake and subsequent weight loss. Caffeine has also been shown to enhance exercise performance and increase the use of fat as a fuel source during physical activity. Additionally, caffeine may stimulate the release of certain hormones, such as adrenaline, which can increase metabolism and energy expenditure. However, it is important to note that the effects of caffeine can vary depending on individual factors such as weight, age, and tolerance levels. As with any dietary supplement or weight loss aid, it is important to consult with a healthcare professional before incorporating caffeine into a weight loss regimen. Another potential mechanism for caffeine's slimming effects is its ability to increase thermogenesis, which is the production of heat in the body. This occurs through the activation of brown adipose tissue (BAT), which is a type of fat tissue that burns calories to generate heat. Caffeine has been shown to increase BAT activity, leading to an increase in thermogenesis and energy expenditure.
Furthermore, caffeine may also have a positive effect on gut health, as it has been shown to increase the production of short-chain fatty acids (SCFAs), which are important for maintaining a healthy gut microbiome. A healthy gut microbiome has been linked to weight loss and a decreased risk of obesity.
Overall, while caffeine has demonstrated some potential as a slimming agent, it is important to remember that its effects are modest and should not be relied upon as the sole means of weight loss. A healthy diet and regular exercise regimen are still the most effective ways to achieve sustainable weight loss.
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