my experience...
ran t3 at 200+ mcg/day for 9 months... thinking it was t4.
started at about 10% at 230/235.
bodyfat dropped to 8% after a few weeks, then 6% and finally settled at 5% after about 8 weeks and remained at 5% for the remaineder (until I was admitted to the hospital. lol)
bodyweight dropped steadily 10lbs, then 5, then 10, then 8.... whatever, I forget the exact numbers.
all in all, I went from the 230's down to the 170's in 9 months, and after the first 2 months, my bodyfat remained the same (5%), so the rest of the 7 months, all the weight I lost was catabolized muscle.
felt like shit for the last 7 months as well... weak and tired. I'd get home, sit down on the couch with my food and fall asleep sitting up before I took the first bite.
was taking in 4-6k kcals as well, and running test, tren and for a few months towards the end anadrol at 150-250mg/day.
eating shitty food.. ice cream, doughnuts, pizza, hotdogs.. everything I could that was high kcal because I couldn't figure out why I was dropping weight so quickly.
I ended up in the hospital with Thyrotoxic Periodic Partial Paralysis with CK levels in the 1200-1500 range. woke up unable to move my legs and most my torso. after being on a bed in the ER, they finally realized my potassium was 2.1 (I believe.. it was just above 2... could've been 2.2) and they freaked out and said I may be put on a ventilator because my diaphragm may stop working and I'd stop breathing on my own.... so, after an hour of blowing (or sucking? I forget) on a plastic breathing test thing, they gave me 2 tablets of potassium.
15mins later, I noticed my foot was moving. (like how you move your foot in bed when you're bored... since I'd been in that bed for about 12hrs at the time)... then the nurse noticed it and asked if I could walk... so I tried and holy shit, I could walk... not steadily, but I could walk and move.
they kept me that night (Friday), and Saturday, and finally I checked myself out against medical advice sunday night. after a chest xray, 4 or 5 CT scans from my neck to my pelvis, as well as a spinal tap. (hoooooooooly fuck. do NOT EVER get a spinal tap unless you're absolutely SURE you need it. you'll have a migraine for 10days afterwards and your neck/back/head will feel like it's made from Styrofoam and brittle as fuck.)...
... oh, and a $160k medical bill. (thanks Manpower Research/MP Research... for your awesome peptides/research chems.. fucking piece of shit.)