N2 nicotinic receptors are found in the brain, plus the autonomic and parasympathetic nervous systems [1]. Different subunits make up these two types of nicotinic receptor, which is why we consider them separately. Muscarinic receptors have a different mechanism of action.
Your body weight can regularly fluctuate, but the persistent, unintentional loss of more than 5% of your weight over 6 to 12 months is usually a cause for concern. You should pay particular attention if you experience other symptoms, such as tiredness, loss of appetite and a change in your toilet habits.
Fat is stored in the body for many reasons. When too much fat is accumulated we become overweight or obese. Eating too much fat can make us overweight, but so can too much carbohydrate or protein. In fact, the over-consumption of fast carbohydrates is more closely linked to overweight and obesity than fat consumption.