Congratulations on a successful P2!
P&I doesn't say much about P3 so different people have tried different variations and had varying degrees of success. All we know from Dr. Simeons is to eat no sugar and no starch, and to be careful of very sweet fruit.
Some choose to count calories and that works for them. They often use the calculation of 11 x body weight to figure out how many calories to eat. Most people ease into the full number of calories. It is difficult to go from eating 500 to eating 2000 in a day. You have to work up to it to avoid feeling sick.
I don't count calories. I just eat fat, protein and non-starchy vegetables. I eat until I'm comfortably full (not stuffed). That works for me. I don't eat fruit very often in P3, and I don't do much experimental baking in P3 with coconut flour, almond flour, etc. I do eat a lot, and I find I gain weight if I don't eat enough fat, protein and calories. Usually if I've gained a little in P2, a day filled with butter and meat will take the weight off.
I disagree with your doctor. I think your body has been living on the 500 calories plus another 1500-2500 calories of burned fat while in P2. If you suddenly cut down to 1000 or 1500, you're body will wonder why you're starving it. And I've seen a lot of people gain in P3 from not eating enough. So, wait 72 hours (that's 3 full 24 hour days) to begin P3. And eat until you are full, no matter the calories.
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