No they can&#x27;t.<p>While it&#x27;s true that people&#x27;s metabolisms vary widely, and the amount of calories for one individual to maintain weight might make another gain, it&#x27;s not true that the weight gain is outside of their control. They have control over how much food they eat.<p>If you&#x27;re gaining weight, it means you&#x27;re eating more than your body can burn, so you need to eat less.<p>This is not as attractive an answer as &quot;i just have the wrong gut microbiota&quot; but it&#x27;s far more accurate.