Is coffee good for weight loss?

Coffee is one of the most commonly consumed drinks in the UK. While it can support weight loss efforts in small, indirect ways, coffee does not cause weight loss on its own.

Long-term evidence suggests that unsweetened coffee is associated with slightly less weight gain over time, while coffee drinks containing added sugar are linked with greater weight gain. Studies have also concluded that drinking coffee moderately is generally associated with health benefits rather than harm, but does not drive weight loss independently.

In this guide, you can learn how coffee may affect your weight, which types of coffee are most compatible with weight loss, when timing may matter, and what the evidence does – and does not – show.

Coffee does not burn fat or replace the need for a calorie deficit. So, how might it contribute to weight loss? There are a few possible ways it might help.

Caffeine effects

One review of randomised controlled trials found that drinking caffeine is associated with small reductions in body weight, BMI, and fat mass, although results vary widely between studies and populations.

Importantly, these changes are modest, short term, and observed under controlled trial conditions – often alongside dietary control or structured interventions. Broader evidence indicates that caffeine alone does not produce clinically meaningful weight loss and should not be viewed as an effective weight loss strategy in isolation.

Caffeine may have a measurable but limited effect on weight-related outcomes, which helps explain why coffee is sometimes associated with slightly less weight gain over time - but it does not drive weight loss on its own.

Low calorie content (when unsweetened)

Black coffee contains very few calories. Choosing it instead of high-calorie drinks may help you stay within a calorie deficit over time.

By contrast, coffee drinks containing sugar, syrups, cream or flavoured milk can quickly add a significant number of calories to your diet.

Behavioural effects

Caffeine can boost alertness and subtly influence daily habits – for example, swapping a snack for a low-calorie drink or helping some people feel more energised throughout the day. These behavioural effects vary between people and are not a reliable or sufficient strategy for weight loss.

There is not enough clinical evidence to support that coffee reduces appetite, though some people do experience this.

Coffee could have a very small effect on weight loss, so long as you drink unsweetened drinks.

Some studies suggest coffee may help limit gradual weight gain, rather than lead to active weight loss. A 2023 analysis found that increasing unsweetened coffee intake by one cup per day was associated with around 0.1 kg less weight gain over four years. In contrast, adding sugar to coffee was associated with greater weight gain over the same period.

One likely explanation is calorie substitution. Plain black coffee contains around 1 to 3 calories per cup, while coffee drinks with milk or sugar can add 20 to over 100 calories per serving, depending on ingredients and portion size. Over time, regularly choosing higher-calorie coffee drinks can meaningfully increase daily calorie intake, even if each drink seems small.

Taken together, this suggests coffee may support weight management at the margins, primarily when it replaces higher-calorie drinks. It is not a weight loss intervention on its own.

Black coffee for weight loss: what the evidence shows

Black coffee is the most suitable option for weight loss because it contains very few calories – typically around 1 to 3 calories per cup.

Long-term research data shows that unsweetened coffee is associated with less weight gain than sweetened coffee. The same research found that added sugar, rather than coffee itself, was the main dietary factor associated with weight gain over time.

This research and other reviews emphasise that coffee’s potential benefits can be reduced or cancelled out by the addition of milk or sugar, meaning that drinking your coffee black might be better for your overall health.

Is coffee with milk effective for weight loss?

Coffee with milk is not necessarily a problem for weight loss, but it does increase calorie intake.

Depending on the type and amount used:

• coffee with skimmed or semi-skimmed milk typically contains around 15 to 25 calories per cup
• coffee with whole milk is closer to 20 to 45 calories per cup
• larger café-style milk drinks can exceed 60 calories per serving

Milk generally contributes fewer calories than sugar or flavoured syrups, which is why it may be a more moderate choice if you do not enjoy black coffee. There is limited direct evidence linking milk in coffee to weight gain, but total calorie intake remains the key factor influencing weight change.

Is iced coffee good for weight loss?

Iced coffee itself is not associated with weight loss. Unsweetened iced coffee has a similar calorie content to hot black coffee, typically around 1 to 3 calories per cup.

However, many shop-bought iced coffees contain added sugar, syrups, cream, or sweetened milk, which can increase calorie content to 80 to 150 calories or more per serving.

In long term studies, higher-calorie coffee drinks are associated with greater weight gain over time, largely due to the addition of sugar rather than coffee itself.

Coffee cannot selectively target fat loss in specific areas of your body.

However, a 2023 study found that increasing caffeinated coffee intake from very low levels to moderate levels was associated with small reductions in total body fat, including visceral fat (‘hidden’ fat around your internal organs).

These reductions in fat were not stronger at higher levels of coffee intake and did not result in measurable weight loss on the scales. The study only included older adults who were overweight and who had metabolic syndromes – which limits how widely the findings can be applied.

If enjoying one or more unsweetened cups of coffee fits within a sustainable daily calorie deficit, it can indirectly contribute to weight loss.

Decaffeinated coffee appears to have similar effects on weight loss to regular coffee, but without the stimulant effects of caffeine.

Large prospective cohort data shows that drinking unsweetened decaffeinated coffee was associated with slightly less weight gain over time, to a similar extent as unsweetened caffeinated coffee.

This suggests that the relationship between coffee and weight may not be driven by caffeine alone. One review found that both caffeinated and decaffeinated coffee are linked with favourable metabolic health markers, potentially related to bioactive compounds (chemicals found in some foods that can influence metabolic processes and promote health) such as polyphenols rather than caffeine itself.

Decaf coffee does not promote weight loss, but when consumed without sugar or high calorie add-ins, it appears just as compatible with weight management goals as regular coffee.

Many people can safely consume around 3 cups of coffee a day, with heart health benefits observed in NHS-backed research. The same research showed that drinking more than 4 cups per day may raise blood pressure or affect sleep in some people, while separate studies show that coffee’s health benefits stop increasing at around 3 to 4 cups per day.

If your goal is weight loss and you are drinking several coffees a day with milk and/or sugar, this could limit your progress. Switching to black coffees or only having one milky coffee a day can help you to cut calories without sacrificing coffee enjoyment.

Coffee is most likely to work against weight loss goals when you add ingredients that increase calorie intake.

Whole milk, flavoured syrups, and sugar-sweetened milk drinks can easily turn coffee into a calorie-dense beverage, offsetting the benefits of coffee itself.

Caffeine-related sleep disruption is another indirect way coffee may make weight management more difficult. Evidence from large reviews indicates that caffeine consumed later in the day can interfere with sleep in some people, and poor sleep is associated with increased appetite, altered hunger hormones and weight gain over time.

Coffee can be included in a weight loss plan, but it should be viewed as neutral to mildly supportive – not a strategy.

Evidence shows that coffee does not cause weight loss, that unsweetened coffee is more compatible with weight goals than sweetened coffee, and that any effect on weight is small and varies between people.

Switching to black coffee and avoiding added sugar can help you cut down calories in your daily diet, while ensuring that you are still able to enjoy the benefits of caffeinated drinks.

There are a number of diets and strategies that help to make cutting calories easier and more sustainable. Our guide: “How many calories should I eat to lose weight?” helps you to decide on the right diet plan for you.

If weight loss feels difficult despite healthy habits, structured clinical support may help. ZAVA offers medical guidance and treatment options designed to support sustainable weight loss.

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