6. Toxins

Another condition that might cause you to gain weight no matter how healthy you eat is if your body is introduced to toxins, chemicals or poisons. For example, some research suggests that MSG (monosodium glutamate), a seasoning used commonly in Chinese and Japanese food, can damage the metabolic sensors that regulate food intake and lead to obesity. Try to avoid all harmful toxins like BPA (bisphenol A) found in most plastics, parabens found in personal care products, cigarette smoke and air pollution.

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