heat will dehydrate you you can lose a tone of water and be a ton lighter but it is dangerous just look at what jockeys put themselves through to lose weight for weigh in or boxing
if you want to lose weight try this
eat during the day to stimulate your metabolism and improve your diurnal fluctuation of important hormones such as leptin that peaks in the evening and is at its nadir in the morning.
eat as musch as your body needs to be in positive nitrogen territory a simple urine test can give you an idea whether or not your nitrogen levels are adequate; positive nitrogen territory stimulates the increase in your endogenous anabolic hormonal profile eg. growth hormone. this eating stimulates your body to build muscle but if you eat too much for too long you will store excess energy as body fat.
the trick is to cycle your diet so your stimulate your metabolic engine and hormone profile by eating for 2 to 3 days then cutting back for 2 to three days. your hormonal profile increases up to 500% in 14 days before it plateus.
then restrict your calories or burn more calories so that your in nitrogen negative territory. however, if you restrict your calories for too long the body porduces too much ketones and inhibits the natural fat buring engine in your body. this slows down your metabolism and affects your leptin levels as well.
leptin is important bcos it stimulates the body to burn its fat stores now remember leptin levels peak at night this is when we should avoid eating bcoz the body gets lazy very quickly; if you eat at night you are stimulating the body to shut down the leptin process bcoz its getting energy anyhow. similar to people who use creatine monhydrate if you eat enough over a period of time the body stop producing its own endogenous source of creatine when this happens it takes months to return the body to normal again.
this cycling stimulates the natural process of breaking down body fat via gluconeogenisis. but the body has to learn if you are having trouble buring your own body fat stores. it takes time. you know if you are on the right track if you consistently drop weight if above your natural level. play around with the time frames just remember it takes about 72 hours to reach starvation this is when the body protects itself to retain its energy sources it takes about 2 days to start the process of storing energy as body fat and takes about 14 days to peak the anabolic hormonal profile
body builders use a similar eating plan to grow muscle and get ripped
good luck