When I was misdiagnosed as a T2, and on only metformin and lantus after DKA and BG of close to 500 ER visit/admission,I found through frequent testing that I could not eat more than about 10-15 grams of carbs per meal with out hitting 250-300 even though my personal goal was to stay under 140 post meals. I was called a T2 simply because I was older- as in 60 at dx.
Would have gone through the pain of drugs that don't work and diets/carb intakes that don't help as well as clinicians who doubted if I was following orders etc, if I had not come here and found the list of tests I needed to get an accurate diagnosis.
With that I'm now on basal/bolus via a pump after having good numbers with multiple daily injections(MDI).
Prior to my dx the only way I could lose weight was to weigh all my foods/meals and log them. Measuring- cups/tsp/TBS did not work as well as a gram scale.
What I have found in my travels and attempts at weight loss after my dx is that you need to find a carb level that does not cause BG spikes. If you're truly a T2 then working on reducing insulin resistance is important as well. Metformin, cardio and strength training can be huge in helping with insulin resistance as well as the liver dumps that can drive your BGs up.
I know as a T1 that the more active I am the lower my insulin requirements, and this applies to T2 as well. It may not play out the same for you but you need to test for carbs/time of day/portion size as well as activity levels cardio/strength training. All factor into how things will play out for you.