Several options can help suppress appetite, ranging from free strategies like drinking water before meals to prescription medications that can reduce body weight by 15% or more. What works best depends on how much support you need and whether you’re managing a medical condition. Here’s a practical breakdown of each category.
Water Before Meals
The simplest appetite suppressant costs nothing. Drinking about 300 mL of water (roughly 10 ounces, or a bit more than a standard cup) before eating significantly reduces how much food you consume at that meal. In a controlled study published in Clinical Nutrition Research, people who drank water before a meal ate about 24% less food compared to those who drank nothing or drank the same amount of water after the meal. The timing matters: water consumed after the meal had no effect on intake at all.
This works through basic stomach volume. Water takes up space, triggering stretch receptors in your stomach wall that signal fullness to your brain. It’s not a dramatic intervention, but doing it consistently before every meal adds up over weeks.
Foods That Reduce Hunger Hormones
Your body produces a hormone called ghrelin that drives feelings of hunger. Ghrelin rises before meals and drops after you eat, but what you eat affects how quickly and how far it falls. No single food suppresses ghrelin on its own, but meals built around healthy carbohydrates (whole grains, legumes) and lean protein (chicken, fish, eggs) lower ghrelin levels more effectively than processed or high-fat meals.
Protein is especially powerful here. It keeps ghrelin suppressed for longer after a meal, which is why a breakfast with eggs or Greek yogurt holds you over until lunch in a way that toast alone doesn’t. Soluble fiber, found in oats, beans, and many fruits, also slows digestion and extends the feeling of fullness.
Caffeine and Green Tea Extract
Caffeine suppresses appetite partly by influencing stomach emptying and partly by affecting hunger hormones. Doses between 80 and 300 mg per day (one to three cups of coffee) can meaningfully curb hunger, particularly when consumed 30 minutes to four hours before a meal.
Green tea contains a compound called EGCG that may boost metabolism and reduce fat. A 2017 analysis found that consuming 100 to 460 mg of EGCG daily for 12 weeks helped reduce body weight and fat mass, and the effect was stronger when combined with caffeine. An earlier study found that beverages containing both soluble fiber and a caffeine-EGCG combination reduced people’s tendency to overeat at their next meal. Green tea extract supplements concentrate these compounds, but plain brewed green tea provides smaller amounts of both.
The appetite effects of caffeine are modest on their own. They work best as part of a broader approach rather than as a standalone solution.
Yerba Mate
Yerba mate, a tea-like drink popular in South America, has some clinical support for fat loss. In a randomized, placebo-controlled study of 60 overweight adults, those who took a green mate extract for six weeks lost significantly more body fat (down 0.3%) and fat mass (down 0.5 kg) compared to the placebo group, which actually gained slightly in both measures. No adverse events were reported, and all safety markers stayed in normal range throughout the study.
These are small effects, and the research base is still limited. But yerba mate also contains caffeine and other stimulant compounds, so it may offer appetite-suppressing benefits similar to coffee or green tea with a slightly different profile.
Prescription Appetite Suppressants
When lifestyle changes and supplements aren’t enough, prescription medications offer significantly stronger appetite suppression. The newest and most effective options mimic a gut hormone called GLP-1 that targets areas of the brain regulating appetite and food intake.
GLP-1 and Dual-Hormone Medications
Semaglutide (sold as Wegovy) and liraglutide (Saxenda) are injectable medications that copy the action of GLP-1, a hormone your gut naturally releases after eating. They slow stomach emptying, reduce hunger signals in the brain, and make you feel satisfied with less food. Tirzepatide (Zepbound) takes this a step further by mimicking two hormones, GLP-1 and GIP, for even greater appetite suppression. All three are approved for long-term use.
These medications produce substantially more weight loss than older options. They’re prescribed for people with a BMI of 30 or higher, or 27 with at least one weight-related health condition. The most common side effects are nausea and digestive discomfort, which typically improve over the first few weeks as the dose is gradually increased.
Combination Pills
Two oral medications combine drugs originally developed for other conditions to suppress appetite. One pairs phentermine (a stimulant that lessens appetite) with topiramate (a seizure and migraine drug). The other pairs naltrexone (used for alcohol and drug dependence) with bupropion (an antidepressant that also helps people quit smoking). Both are approved for long-term use and work through different brain pathways than the GLP-1 drugs.
Short-Term Stimulant Options
Phentermine on its own is one of the oldest appetite suppressants still in use. It works similarly to amphetamines, stimulating the central nervous system to reduce hunger. The FDA approves it only for short-term use (a few weeks). It’s not appropriate for people with a history of heart disease, stroke, uncontrolled high blood pressure, overactive thyroid, glaucoma, or substance abuse. Phendimetrazine is another short-term option in the same drug class, with similar restrictions. Taking these medications longer than prescribed or combining them with other appetite suppressants raises the risk of serious heart and blood vessel problems.
What Actually Works Long-Term
The approaches that sustain appetite control over months and years tend to combine multiple strategies. Protein and fiber at every meal provide a baseline of satiety. Water before meals shaves calories without effort. Caffeine or green tea can take the edge off between-meal hunger. For people with significant weight to lose, prescription GLP-1 medications have changed the landscape, offering a level of appetite suppression that lifestyle changes alone rarely match.
The biggest mistake people make is looking for a single supplement or pill to solve the problem in isolation. Appetite is driven by hormones, habits, sleep quality, stress levels, and the composition of your meals. The most effective plan stacks several modest interventions together, creating a cumulative effect that’s much stronger than any one of them alone.