What the evidence says about green tea, black coffee, and weight
The question of whether green tea aids weight loss has been studied reasonably well. The most widely discussed mechanism is that EGCG and caffeine together may slightly increase the rate at which the body burns calories at rest — an effect sometimes called thermogenesis. Most studies suggest any benefit is modest: think small increments over time rather than dramatic change. The effect also tends to diminish for regular caffeine consumers whose bodies have adapted to it.
Green tea specifically
Green tea is one of the lower-caffeine options compared with coffee, and its EGCG content is higher than in black or white tea. Some research links regular consumption to small reductions in body weight over time, though results are inconsistent. It is best framed as a supportive habit rather than a meaningful weight-loss tool on its own. See the green tea for weight loss overview and how green tea aids weight loss for a deeper look at the evidence.
Black coffee
Black coffee (without milk or sugar) is calorie-free and its caffeine content can mildly suppress appetite for a short period and marginally raise metabolic rate. Many people on GLP-1 medicines already experience reduced appetite, so coffee's appetite effects may be less noticeable. If caffeine worsens nausea — a commonly reported side effect of GLP-1 medicines — some people find switching to a lower-caffeine option more comfortable.
Peppermint tea
Peppermint tea is caffeine-free and has no meaningful direct effect on fat metabolism. Its value on a GLP-1 journey is more about comfort: many people find it soothing for the digestive side effects that can accompany these medicines, such as nausea or indigestion. It also contributes to daily fluid intake, which matters for overall wellbeing.
For a broader look at drinks and habits that support your progress, the weight loss aid guide covers this alongside other lifestyle factors.
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Progress on a GLP-1 medicine is rarely just about the number on the scale. Understanding how your habits — including hydration, drink choices, sleep, and energy levels — connect to your results is where tracking becomes genuinely useful.
GLP Trackr's daily morning check-in lets you log weight, mood, energy, food noise, sleep, and water intake in about 30 seconds. Over time, the app's insights and correlation explorer surfaces patterns in your own data — for example, whether days with better hydration or more sleep tend to align with steadier progress. That kind of personal insight is hard to spot without a log, and it gives you something concrete to discuss at your next prescriber appointment.
If you want to track the calories and macros in your drinks more precisely — a matcha latte, for instance, or a coffee with oat milk — the AI photo scan and barcode food logger makes it quick to capture. Small things add up, and on a GLP-1 journey where portion sizes are already smaller, every logged detail helps build an accurate picture.
For a full view of how tracking supports your weight-loss journey, visit the weight loss tracking hub.
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GLP Trackr is an informational and tracking tool, not a substitute for professional advice. If you have questions about how your diet, drinks, or lifestyle interact with your prescribed medicine, your prescriber or doctor is the right person to ask.
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Frequently asked questions.
Green tea contains EGCG and caffeine, which research suggests may offer a small boost to metabolism and fat oxidation. The effect is modest and varies between people — it can support a healthy routine but is not a significant weight-loss tool on its own.
Green tea is generally a low-calorie, low-caffeine drink that fits well alongside a GLP-1 medicine as part of a balanced approach. It does not interact with the medicine's mechanism in a meaningful way, but any specific questions about your diet should go to your prescriber or doctor.
Black coffee, consumed without milk or sugar, is calorie-free and caffeine can mildly suppress appetite and slightly raise metabolic rate for a short time. The effect is small and may be less noticeable for people already experiencing reduced appetite on a GLP-1 medicine.
Peppermint tea is caffeine-free and has no direct effect on fat metabolism. It is valued by many GLP-1 users for its soothing quality on nausea and digestive discomfort, and it contributes to daily fluid intake — both useful on a GLP-1 journey.
GLP Trackr's daily check-in logs water intake alongside weight, mood, and energy. The food logger — including AI photo scan — captures calories in drinks. Over time, the insights feature helps you spot patterns between your habits and your weight-loss progress.