Opiate abuse can cause weight loss, but the extent to which weight loss occurs can vary depending on the individual and their specific circumstances. Opiates can affect appetite and metabolism, leading to changes in weight.

Opiates can reduce appetite, which can lead to a decrease in food intake and subsequent weight loss. Additionally, opiates can impact metabolism, which can cause the body to burn calories more quickly and contribute to weight loss.

However, chronic opiate use can also lead to malnutrition and nutritional deficiencies, which can contribute to weight loss. Nutritional deficiencies can lead to muscle wasting, which can cause a decrease in body weight.

Overall, while opiate abuse can cause weight loss, it is important to note that this is not a desirable or healthy way to lose weight. Chronic opiate use can lead to a range of negative health effects and should be addressed through appropriate treatment and support.