Magnesium is not a direct weight-loss agent. Sustainable fat loss depends on energy balance, diet quality (protein and fiber), sleep, stress, and physical activity. Magnesium may help indirectly if a deficiency is contributing to poor sleep, high stress, muscle cramps, or reduced exercise tolerance—correcting that can support healthier habits. However, that’s not the same as “magnesium makes you lose weight.” Some forms with laxative effects can cause temporary scale drops due to bowel movements or water loss, not fat loss. Position magnesium as a supportive nutrient within a broader lifestyle plan. If weight loss is difficult, factors like thyroid function, insulin resistance, sleep disorders, medications, and overall calorie intake usually play a bigger role.