I started drinking coffee about a year ago, and I have never heard this claim before. I have always known that black coffee is a low calorie drink, and other coffees with extra sweetener and creams make it more unhealthy and higher in calories. I never have thought that coffee could positively help weight loss, which is why I wanted to further research this claim.
When researching this claim I found a trustable article by Medical News Today. They did a study tracking caffeine intake on weight loss. Data from three significant health studies was analyzed in this study, which included over 155,000 individuals but removed those with significant medical issues or missing data. Researchers watched individuals' coffee drinking patterns, including whether they drank normal or decaf and if they added sugar or cream. Then, taking into account variables like nutrition, activity, and health issues, they tracked weight changes every four years. Drinking a cup of coffee each day was linked to a slight weight loss of 0.12 kg over four years. On the other hand, adding a teaspoon of sugar daily led to a small weight gain of 0.09 kg. These effects were more noticeable in younger people and those with a higher BMI. It also was proven that using cream or sweetener did not significantly affect weight. This goes to show that coffee can help weight loss, but it is not a significant contribution to weight loss, as losing 0.12 kg is not a very large amount especially for four years. In another trusted source Mayo Clinic I found also talked about this claim. They say that it depends on the kind of coffee you are drinking. Plain black coffee has very few calories, but adding sugar or cream increases the calorie count. Mayo Clinic states, “One study showed that adding just 1 teaspoon of sugar to a cup of coffee a day was linked to weight gain.” (Mayo Clinic). This shows that having a cup of coffee with added sugar is going to lead to weight gain, not weight loss.
This claim is somewhat true, but it is not specific enough to be completely accurate. While coffee may have a slight impact on weight loss, it is not a significant factor. However, this effect is minimal, especially over such a long period. On the other hand, adding sugar to coffee can contribute to weight gain, as studies indicate that just one teaspoon of sugar per day is associated with an increase in weight. While coffee alone is not a major weight-loss tool, drinking it without added sugars may have a small benefit.
Sources-
https://www.medicalnewstoday.com/articles/could-unsweetened-coffee-help-with-weight-management#Does-coffee-help-with-weight-loss
https://www.mayoclinic.org/healthy-lifestyle/weight-loss/expert-answers/calories/faq-20058100