Hmm. I've actually gone on a ... lets say 700 calorie a day diet, and did not gain it back, but in my case, the 700 calories were probably 95% from protein, so I was working hard to maintain muscle mass. The 'gain back more then you lost' typically means you triggered metabolic slowdown, probably through losing muscle mass. The more 'extreme' your diet, the more careful you need to be.
I'm not suggesting you go that low, however. I don't know anything personally about pcos, but you should speak to other dieters with it ... I have never used any herbal supplements while dieting, but there are stacks that can help. Trying to crank up your metabolism to burn fat off is not a great idea, trying to _maintain_ steady metabolism while in caloric deficit is almost certainly much safer.
I've read some excellent books on nutrition and dieting by lyle macdonald. He has a website ( link As well as the articles, check the forum - you can probably find people with metabolic issues more like yours there who coudld provide good advice.
Good luck. If its of any help, feel free to message me.
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I read from many fitness experts is to not go on a diet. The key is to adopt a healthier lifestyle. Do you go cold turkey on the bad stuff? Of course, not. It's good to treat yourself at times. However, you must cut that stuff out. Don't use the scale. Use the mirror as a gauge. Because you have a lot fat to lose, do more cardio or interval training. Go on YouTube and look for channels like athlean-x or sixpack shortcuts. They have many videos that address healthier diets. Stick to fresh produce.
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My best advice would seriously be to stop asking the internet for advice on these kinds of things that pertain to your physical health. If you have a condition that causes your weight to fluctuate in either direction, the best way for you to get any advice that is at all trustworthy is to talk to your doctor. If you really want to get the best advice, have your doctor refer you to a nutritionist who can help you set up a personal plan that will work for you, and adjust it as needed. The internet can only help you so much, if you're really serious at some point you need to consult professionals.
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