Of course, what happens when you finish, and go back to eating regular food? I believe any diet based on things you can't sustain if in larger doses when you meet your goals are a surefire path to rebound. When start dieting, and give something up, the question has to be, "is it possible or likely that I will be giving this up for the rest of my life. And if so, what am I going to replace it with?
I'll give a good example of what I mean. I take my coffee light and sweet, 2 scoops of sugar per cup, so on a large double cup, that's 4 scoops of sugar. BOOM, 60 Calories, 12.8 grams of carbs devoid of any other nutritional value right there, and let's face it...one cup? NO. But I NEED my coffee...and I HATE the taste of every artificial sweetener I'd ever tried up till now. The only solution for the diet would have been black coffee, and I had to face facts, when the diet was done, I would start using sugar again. So I started trying to find something to replace it with long term. Smaller doses of sucralose at first, but then I tried Stevia, and found something that tasted fine that I could use for the rest of my life, and not have to go back to 4 scoops of sugar in what?4 large cups of coffee a day? 240 Calories? That's almost a MEAL with no other nutrition. It's the suitable long term replacement that was the key. If I hadn't found the replacement, I would have had to keep using sugar during my diet, had less cups of coffee and given up other things, or accepted a longer wait to meet my goals.
I think that last line is important. No. I didnt' give up butter in my diet. I hate margarine. I made better decisions about what to put butter ON and what not to, but knowing that I wasnt' going to give up butter long term, I had to keep using it on things that needed it's creamy goodness, like my baked potatoes.
So as you start logging what you're eating and as you plan how you're going to take in less while you burn more so that you lose weight, I recommend staying away from any "Diet" that targets a particular area and says "None of that!" Carbs are the biggest example. Yeah, Knocking out Carbs is a great way to lose weight, but are you really going to go super low carb for the rest of your life? No. And seriously...You NEED carbs. Carbs are not the devil...Excess is.
So what do you knock out? The answer is what everyone KNOWS it is, but our love of shortcuts makes us try to find quicker ways. The answer is Calories. Based on your current weight, and your loss goals, you set a Maximum Net Calorie budget and you don't' exceed it. For me, that Max was 1650 Net, Meaning that if I burned 350 Calories from Exercise, I could take in 2000 calories a day and expect to steadily lose weight.
Don't forget the minimum. You need to take in a minimum of 1200 calories a day. That's pure intake, not net, so if you take in 1200 and burn 1300, that's fine, it's just that if you take in less than 1200 calories regularly, your body begins to starve, and your metabolism compensates by slowing down which, when you go back to eating again means an immediate rebound.

A good App like MyFitnessPal can help you keep track of it, watch your intake and from there, it's easy. Stay under the Calorie, Fat, Sugar and Sodium targets, Stay over the Vitamin, Mineral, Fiber and Protein Targets, and as you continue to watch it, track it and follow it, what you learn isn't' what's healthy to eat, come on, we're not idiots, we KNOW what's healthy and what's not...What you learn is how to eat healthy while eating what you like to eat. THERE is your sustainability. I'm not a big fan of Chicken Breast, but it's a lot lower calorie than Chicken Thighs...But did you know Pork Tenderloin has less calories than chicken breast? I didn't. I LOVE pork Tenderloin. Now you might hate it. but my point isn't "Eat Pork Ternderloin." My point is ignore anyone who in the process of giving you diet advice says "Eat this. or Dont' Eat that" Learn what a healthy diet consists of, Track what you're eating, and find the things that you love to eat that fit in those budgets. Then, when you meet your goal, and you're ready to start taking in 2000 net Calories a day rather than 1600, You aren't going back to habits that got you fat in the first place...You're just loosening the restrictions on quantities you were consuming while you were working so hard to lose.