The dieticians love telling us to count this, measure that, eat certain portions of A, B and C, and drink X liters of water a day.
The underlying assumption is this: your body is a useless, malfunctioning contraption that can't be trusted to feed itself. But this cannot possibly be true. If it were, we would have died out before we even crawled out of the primeval slime. Feeding behaviour (or energy regulation, if you want to be technical about it) is so fundamental to life that even the most brainless organisms can do it. Even viruses can do it, and they're barely even alive. So where did it go wrong with humans?
Those of us who have stuck with low-carb for a while know from experience where it went wrong: processed foods and "low fat" diets, which seem to cause appetite disruption and metabolic derangement. Avoid those things, and you'll be fine. And "Avoid those things" allows for an extremely wide margin of eating behaviours.
But old habits die hard. The most frequent questions we get are along these lines : how many carbs should I eat? How much fat? How many calories? How many meals a day? What about my portion sizes?
With one proviso (avoid starchy ingredients and add fat where possible), the short answer is: whatever you feel like. Hand back control to your appetite. It knows what it's doing. Or, at least, it will relearn, once you start giving it proper food instead of synthetic substitutes.
Certainly it's worth keeping tabs on things for the first few days, because many people find they acquire an instinctive feel for what's best avoided, and what low-carb ingredients suit them better, by checking macro content. It can be intellectually interesting to see your calorie intake fall as your internal mechanisms drop out of gimbal lock. But if you find yourself counting things for more than a couple of weeks, it's time to take your training wheels off. It might be a little scary at first, but then it's a whole lot of fun.