BPC 157 is primarily known for its healing properties, particularly in the gut and tissues, rather than its effects on weight. There is no substantial evidence to suggest that BPC 157 directly causes weight gain. In fact, some studies on rodents have shown that BPC 157 may have a positive effect on weight management, potentially aiding in the reduction of body fat. However, these effects are not as directly associated with weight loss as those of other peptides designed specifically for that purpose. As with any supplement or medication, individual responses can vary, and what leads to weight gain in one person may not have the same effect in another. It's always best to consult with a healthcare provider for personalized advice.