I can only share my experience. This is what works for me.
I am just over 8 months out. I CANNOT EAT OVER 1000 calories on the reg and lose weight. I can maintain at 1050-1100. Anything more and I gain. I'm at 126 lbs. My original goal was 150. Crushed it. My surgeon said I was perfect at 135lbs. Good for him. I WANT to continue to weigh 125-127lbs.
But, to maintain this weight, it takes constant vigilance and work. It's a drag sometimes. Isn't everything?!
For me that means I have to eat high protein and super low carb. I have to be very strict almost all the darn time. Like, under 55 carbs a day. And, those carbs have to come from good foods. I enjoy Friday Funday every week with my husband now that I'm at my happy spot. Here's what that looks like; the toppings from two small slices of supreme pizza. One small bite of thick crust, (my only bread, ever), a 2oz cup of trail mix (the kind with dried fruit AND M&M's) and 1 tiny handful of popcorn. This is over 2-3 hours. I also have a double Tito's screwdriver--light on the OJ/heavy on the ice--long before I eat anything. Add to this a protein shake and a Keto Coffee with Chocolate Greens throughout the rest of the day and you have summed up my wild and crazy eating adventure day! I usually gain 1/2-1 full pound. Then I have to lose it!
You can imagine the rest of the week.
That's how I maintain my ideal weight. If I feel like losing a pound, I cut a few carbs. If I feel too slim, I add some.
I never worry about fat...never buy/eat low fat products because they have added sodium and sugar. Good fats are good fats. I don't cook with salt, eat fast food (except a few bites of Wendy's chili every now and then). I keep my bag primed with protein bars. And I don't put junk in me because I didn't come this far to fail my body after the amazing response it's given me with this fab tool.
But, it's not for everyone. I have a butt ton of support from my husband. I am retired and control my environment. I have a "piss off you psychos" attitude that makes me hard to corrupt when I'm out with girlfriends who are trying to get me to drink or eat crap.
To most people it sounds like my food situation sucks. To me, I finally feel like food isn't controlling my life. I don't live for it anymore. It's just a survival mechanism. It's not a pleasure or a comfort. It just keeps me alive and healthy. Then on Fridays? I add a little sparkle! (It's always enough.).