My first response to this question is, well I am not a registered dietitian. My second thought is, the best,huh.. *head scratch* Well that depends ... on several factors. And then I will start asking questions like: What do you like/normally eat? What is your understanding of nutrition? Have you ever kept a food journal (calorie or picture)? How many calories would you guess you eat a day? Do you eat more on days you do more physical activity? Less on days you are couchsurfing? What are your main protein sources? What are your main carbohydrate sources? What meal do you have the most difficulty with? What are your nutritional vices? How often do you eat out? What kind of calories do you drink? What do you add to your coffee? Have you ever practiced meal prepping? Have you ever worked with a registered dietitian?
Usually the person becomes disinterested and interjects, "What do you think about [fill in the diet jargon/word of current pop culture]. This has been happening to me for over 20 years, the pop culture "diet" has changed many times.
My experience would tell you that developing habits will serve you much better than following the "diet" flavor of the times. It could be "the best" engineered diet program of the century mapped out by a super nutritionist.. but if it doesn't fit you and your lifestyle - you may follow it for a period of time - then migrate back to your old habits and eating patterns. Habits become deeply ingrained. They are the auto-pilot of your brain. Without habits, you would be bogged down with constant decision making all day long. You'd be lucky to make it out the front door, let alone follow a strict diet that is outside your wheelhouse. When you are stressed from school/work, nutrition most likely will take a back seat on your mental priority list - and your habits take over. Here's the thing, our brain doesn't know difference between a 'bad' habit and a 'good' habit - it just goes to the path you have been programming it to go for years. So in my mind, the best intervention would be to reprogram your habits. This takes time. Changing everything all at once is a huge change. You may be the anomaly that can change everything and be successful. But for the rest of us, picking one behavior/habit that can be improved upon - will set you up for success. Although this approach may take a little more time, it will set you up for long term success & help to avoid 30-90 day success and the crash off the diet wagon. When deciding which behavior/habit to select think of what will have the biggest return on investment for you. Maybe it is: eating a better breakfast than half a dozen donuts; bringing your lunch instead of getting fast food; planing dinner instead of a 30" pizza; drinking less calories (soda, Gatorade, fancy coffees), portion control of a specific meal. Whatever it is, think of what your set backs have been in the past and plan how to address/combat these, because there will be hiccups in the plan. Continue to practice and if you continue to miss the mark, adjust the strategy to keep you on the path to improvement. My strategy is: plan, practice, evaluate, modify the plan (or) stay the course.
My suggestion would be to start with a "this" not "that" approach. Once you have gone through your meals and cleaned them up a bit - you can go back and fancy them up as much as you'd like (more veggies, leaner cuts of meat, maybe organic, forbidden rice, whatever speaks to your inner hippie). The important thing is to establish better patterns/behaviors. I think of mine in terms of an anchoring system - or - a nutritional framework. Once my frame/skeleton nutritional routine is set I can indulge a bit or tighten up from time to time [we can dive deeper into that at another time] depending on my goals.
Best case scenario, partner up with a registered dietitian to help you with this journey/process.