Would like to answer this as accurately as possible. Corsets increase central venous pressure which can raise blood pressure some, generally not to a dangerous range unless you are already hypertensive. Sherry,the increased venous pressure is the reason those hemorrhoids enlarge. Posture is maintained by muscle tone and skeletal structure. Yes, the corset places you in a good posture, but it enables the muscles to loose tone. Your grandmother lost her posture so rapidly because lack of the artificial support of the corset and her lack of muscle tone. Plus us old people have a fair amount of osteoporosis, both male and female but greater in the female. The only organs very moveable by a corset, are the intestines. Everything else is anchored behind the peritoneum except ovaries which are not an issue. With extreme compression, the liver may move upward a little. You will also get some shortens of breath. It probably will decrease your appetite cause the stomach will be compressed by the colon and other bowel. Heat on the abdomen will not burn fat. You will loose more weight by the decreased appetite. Don't every one go get a corset to lose weight!!
Laura