Maybe. Studies have reported that restricting dietary methionine intake can increase fat oxidation and reduce hepatic lipid content in patients with metabolic syndrome, which may aid weight loss. Furthermore, feeding obese and prediabetic mice a low-L-methionine diet can restore their metabolic health. Most importantly, they lost weight and experienced a significant reduction in body fat, shedding approximately 70% of their fat within a month. However, these studies have certain limitations and cannot be used as clinical reference data.