HIIT results?

I plan on doing an HIIT workout every other day, and just regular cardio / body weight training (using my own body, not weights) on days that I don't do HIIT all along with a nutritious diet. I would like to know if anyone here has any experience with HIIT and how long it took them to lose weight, how much they lost, and if any of it was noticeable to others. I read this one story online about this middle-aged woman losing 5 pounds in 2 weeks, and I'm 18 years old so I don't think I would have too much problem with weight loss... research online has taught me to think so at least. Also, I am ~180 pounds so I am overweight but I plan to change that and get fit fast.