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.
The Negatives of Stress: Weight Gain. While stress may temporarily increase your metabolism, it's not good for your weight. Chronic stress causes a dip in your metabolism from loss of precious calorie-burning muscle and increases your appetite and desire for unhealthy foods, and it may also cause an increase in body fat and belly size.