As many have said, this isn’t a calorie restricted way of life but how do you make sure you aren’t calorie restricting? I used a couple resources to set my macros, one was mentioned by @JohnH in the link he provided. Use 1.5 to 1.75 grams of protein per KG of body weight. I used the low side of this scale to set my protein level. Metabolic Rate Calculator I used this calculator to figure out my basal metabolic rate in calories. This is how much energy I need to consume to support my metabolism. When you restrict calories your metabolism slows. The last piece was using a macro nutrient calculator like My Fitness Pal or Cronomter. I plugged in my calculated protein number and my carb number at 20g and then dialed up my fat to meet the total caries my basal metabolic rate needs. This is my starting point, the next step is to listen to my body.
I spent the next 6 weeks getting fat adapted using these macros to help me. Slowly my fat intake dropped on its own, because I wasn’t hungry. My body got better at taking the fat it needs from my stores rather than me eating it. I wasn’t restricting calories but got my insulin levels low so my body could gets its needed energy from my fat stores.
After two months my weight loss stalled and I read Dr. Jason Fungs work and started implementing those tools.