Long-term consistent use of ECA will help to suspend or even increase both the T4->T3 conversion rate and the rate of fat burning. It will help the most for about the first two months of use. If you get really lean or really start to starve yourself I think the only option is some kind of hard core diet drug drug like T3, clen, DNP, etc. (I have never used anything hardcore, so I don't know what to pick). I have read that certain prohormones will help to retain lean mass and/or strength (1-test for mass, 3-alpha for strength, both for hardness). I think you are better off not going on a starvation diet unless it is necessary for a show or something, because starvation dieting will lead to a susequent rebound. This rebound could lead to some muscle growth as in the ABCDE diet, but I think a lot of fat-gain is also inevitable.