When you hit a heart rate of 160–180 BPM your body will look for anything it isn’t using for fuel. Since you’re exercising it will not use muscle, it will move on to readily available carbohydrates. If those are unavailable, it will go for fat. Not only that but once your threshold is broken, it will use the source it has found until the recovery phase is over, which can be up to two hours depending on your workout and metabolism.
What this boils down to: FIRST, consult your doctor and make sure that you are healthy enough to start this type of course. Then, change your work out. When I go on a cut phase I do fasted AM cardio. What that means is that I will wake up and work out before breakfast when the stomach is empty (thus, no carbs). Start with a warm up, a light jog or something, then do wind sprints at about 80% of your ability. I can’t tell you how hard that is since I am not you, don’t go all out, but make sure it’s difficult. When you start getting winded. Do 2 more, at 100%. Give it everything you have for those last 2. Your heart rate will peak. From there, do a cool down then go home. Eat before you shower, but eat smart and light. Grab an apple and a light protein shake (guys and girls alike, we work the same). The simple sugars in the apple will give you energy to burn for the time being and the protein will help you build muscle (contrary to popular belief, this will not make you muscular so don’t try using that excuse). After your light breakfast, take a shower and get ready for your day. This gap will maximize the amount of stored fat your body will draw from. From there eat a high fiber breakfast and go about your day as normal.
I gave my father this advice. He weighed just under 300lbs and is 48 years old, well 49 now, this was last summer when doctors said he needed to lose weight for a diabetes scare. He lost 20 lbs in 3 months with an elliptical. Now yes, some of this was water weight, but of the weight he lost then (he has since quit the program) he has kept 20 of the 45 lbs that he lost off.
Outside of this. Be active. You don’t have to worry as much about what you eat as long as you’re burning more calories than you’re consuming. THIS DOES NOT MEAN THAT YOU STOP EATING AS MUCH. Eat normally, just go play, take a walk, heck wash your car. Just do something for 30min to an hour outside of your work out.
Source: 5 years of weight lifting and “working out”, advice from many exercise forums, input from people I have worked out with, as well as advice from my Aunt, who has been a professional body builder for decades.
As far as supplements go, don’t waste your time. 9 times of 10, they don’t work.