The caffeine levels in your bloodstream might have an influence on how much body fat you store, which can also affect your risk for developing type 2 diabetes and heart disease.
These insights come from a 2023 study that used genetic markers to better establish the connection between caffeine levels, body mass index (BMI), and the risk of type 2 diabetes.
Researchers from the Karolinska Institute in Sweden, along with teams from the University of Bristol and Imperial College London, suggested that calorie-free caffeinated beverages could be investigated as a method to lower body fat.
“Higher genetically predicted plasma caffeine concentrations correlated with lower BMI and total body fat,” the researchers noted in their paper from March 2023.
They also mentioned that these higher caffeine levels were linked to a reduced risk of type 2 diabetes, estimating that about half of caffeine’s impact on diabetes risk could be attributed to its role in lowering BMI.
The study analyzed data from nearly 10,000 individuals, using genetic databases that focused on specific gene variations related to caffeine metabolism.
In general, those with certain genetic variations often metabolize caffeine more slowly, which allows it to linger in the blood longer, yet they tend to consume less caffeine overall.
The research team applied a method known as Mendelian randomization to assess potential causal links between these genetic variations, health conditions like diabetes, body weight, and lifestyle habits.
While a notable relationship was discovered between caffeine intake, BMI, and type 2 diabetes risk, no correlation appeared between caffeine levels and cardiovascular issues such as heart failure or strokes.
Prior studies have already shown a moderate uptick in caffeine consumption related to improved heart health and lower BMI, and this research further clarifies how coffee affects our bodies.
It’s also crucial to consider that not all effects of caffeine are beneficial, highlighting the need for caution in evaluating its consumption, even as this study marks a step toward understanding optimal caffeine intake.
As the researchers pointed out, short-term trials have suggested that caffeine can lead to weight and fat loss, but the long-term consequences of regular caffeine consumption remain uncertain.
Given the widespread caffeine use, even minor metabolic effects could lead to significant health outcomes.
The researchers believe the associations observed might stem from how caffeine boosts thermogenesis and fat oxidation in our bodies, both of which contribute to our overall metabolism.
Although this study involved a substantial sample size, Mendelian randomization is not flawless. Other unidentified factors could still be influencing the results, necessitating further research to establish clear cause-and-effect relationships.
“Randomized controlled trials are needed to explore whether non-caloric, caffeine-containing beverages could help decrease obesity and type 2 diabetes risk,” noted Benjamin Woolf, a genetic epidemiologist from the University of Bristol.
This research was published in BMJ Medicine.
