Congratulations on beginning your journey! I too am 6’3” and started out a little over 270. Began my journey the first week of June and I’m now at 255. That’s also when I started going to the gym. Started out at 3 days a week and now I’m at a 5 day a week split.
My 38” waist clothes are now loose on me. My triglycerides dropped 130 points in 3 months. My blood pressure dropped 20+ points both systolic and diastolic.
For me, it was sodas and chips/snacks. I do still drink a Diet Dew or two a day, but it’s mostly water and zero sugar Powerade (for electrolytes). Almost completely eliminated fast food and eating out as well. Eat mostly beef and chicken and some fish. Also eat white rice and steamed broccoli a lot.
I try to eat roughly 250g of good protein a day.
PSA: I’m not a physician nor am I giving medical advice. Just simply sharing my experience.
Good luck and take it one day at a time. You can do this!