Instant coffee with water and no sugar. Yes, it’s fine to drink black coffee during your fast without breaking it.
I started with 16:8 and unconsciously went to OMAD. I do not know how long I will do it. That being said, for the short amount I’ve been doing OMAD (1 month), it’s been good to me. So ideally, I continue this habit till I reach my goal. I do plan on putting on muscle after reaching my goal, so I might go back to 16:8 to give me more time to eat more food.
Permanent > x3 days per week > x1 week per month
Don’t worry. Eat your bread and butter without guilt. If your goal is to lose weight, the main (like 95%) of thing that dictates your fat loss is calories. Eat your bread and butter as much as you want as long as you are consuming less calories than your maintenance (literally even a insignificant 200 calories less daily will help your body lose weight)
2-4) fasting is fasting. Doesn’t really matter the duration or type. I can go from 16-8 to omad to full 72 hours all within a week or two depending on how I feel and what’s within my boundaries. Then take a random break because of a social event or whatnot. I work with what I can control and try to work around and make the best with what I can’t control.
Your progress will not be linear. If it goes well, it will look more like an ascending zigzag. The gains will rise, then take a small dip, then ride higher again and dip again. But it will still be so much further than from where you originally started. If you can see this, then it will be easier to be patient.
It’s a big rabbit hole to fall into. So as of now, just worry about getting enough calories and nutrients. Supplement if you have to. And gradually work towards a cleaner diet