100% true. Unhealthy food has fat calories which cause weight gain. If the diet is a healthy one with no fat calories, you will not gain fat. Exercise is also key as it burns calories and reduces chances of various diseases that come with being overweight.
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Your first action in managing this patient should be TO PERFORM A JAW THRUST. The jaw thrust is a first aid strategy that is usually perform on trauma patients in order to prevent the tongue from blocking the upper airways. The jaw thrust should be perform when the patient is in a supine position.