The caffeine in coffee can help slightly with weight loss. However, no studies have shown a correlation between caffeine intake and significant, long-term weight loss or weight maintenance.
Caffeine can temporarily and slightly assist with weight loss because it is a natural appetite suppressant. After drinking coffee, people might eat less because they feel more full than if they had not had any coffee.
Caffeine can also cue thermogenesis, the process of digestion that creates heat and energy, resulting in a minor calorie burn. However, drinking coffee from a chain, such as Starbucks, McDonald's or Dunkin' Donuts, most likely does not result in any of these benefits because specialty coffee beverages tend to include excess sugar and fat, which can lead to weight gain rather than loss.