Dealing with pleasurable activities such as love activates the limbic system which is responsible part for emotions, memory and motivation in our brain. Our autonomic nervous system, responsible for the functioning of our organs, is also affected by these changes in the limbic system. Altering neurotransmitters and hormones with love can lead to lose weight causing an increase in feeling of satiety.
In addition, with a hormonal change, the person who is in love may experience weight loss because this hormonal change makes him/her more cheerful and active. The need for the mind to be constantly engaged with the person in love, and the need to sleep in search of the pleasure of love, is also reduced. Satisfying love relationship brings more useful sleep despite the decrease of sleep. Another effect of sexuality and love and changing hormones is to provide a smoother and more vibrant skin.