Quick question...

When I've mentioned my scale woes, I have gotten several responses about measuring. My question is: how much should I be eating at 3 month post-op?

Have you asked your nut or dietician? Does it specify in your food plan outline?

At 3 months post-op, I was eating a half-cup by volume per meal.

By weight, I eat about 4 oz per meal at 6 months.  At 3 months about 2.5 to 3 depending density of protein.

Yeah, my NUT said no more than 1/2 cup per meal.

Also, with measuring, it is about tracking.

Sometimes we estimate how much we ate, and in reality, it could be more.  If you measure it and then track it, you know if you are under or over your calorie goals.

I was eating 1/2 c of food at ythat stage as well and beginning to work toward 3/4 c.

Ok, so 1/2 cup is pretty close to the consensus. Now, how many times a day were you all choking down a 1/2 cup? I am lucky to get one meal a day and I can eat 1/2 cup, barely... And that depends on what it is. If it is sliderish, I can get down 1/2 cup. If it is more solid foods, I am lucky to eat a few bites. I do have a stricture that is in the process of being fixed (I have an appointment for my second dilation). I also have an ulcer that I am actively medicating.

My plan calls for eating 5 times a day. I usually was able to get 4 of them in at 3 months. 

I was eating 1/2 c three times a day and a small snack before bed. You may not be getting enough calories which could affect your weight loss.