That's 20 lbs in one month? Don't think it's healthy
It is i done it before with alot of dedication, it's hard but if you do it the right way it possible.
Love, if you will out and eat write you can. It's healthy abd maintainable. I lost 40 in three mouths. Completely healthy. Just makes sure you drunk tons of water and green teas. Eat right. And with out. You will lose the weight.