7.0 is in my opinion too high. (It represents an average blood sugar of 152) Medical community has it as the cut off point and like to keep diabetics lower ( non diabetics generally run around 5.5) but it is an indication that at least some of the time your sugar is high enough to be causing damage to your organs ,capillaries and nervous system. You can eat the same amount of calories just change where you get them . Less carbs more protein . Personally I could not handle that higher dies bothered my digestive tract and had bouts of diarrhea.
Below from www.sugarmeds
Does metformin always cause weight loss?
Not every study is conclusive. There are also some conflicting data in the literature in terms of whether metformin causes weight loss. One review analyzing studies describing weight changes under metformin concluded that there is not sufficient evidence to recommend metformin as a treatment of overweight individuals. This may be partially due to the metformin dose. Accordingly, some studies indicate that the weight loss efficacy of metformin can be dose-dependent. For those patients who are not using 2000 or 2500 mg of metformin may not be able to lose weight.

The controversial results may be largely due to different degrees of insulin resistance in the study populations. A Turkish study described an average weight loss of 20 pounds in patients with pronounced insulin resistance.
Another study reported that 25 of 26 severely obese women (refractory to diet) a weight loss of at least 5% within the first 6 months of metformin therapy.

The bottom line, data suggest that the efficacy of metformin to reduce weight depends at least partially depends on the degree of insulin resistance.

Today, we know the strong link between weight gain and insulin resistance There is compelling evidence that insulin resistance is a major contributor to abdominal obesity. Yet, it hasn’t been clarified if insulin resistance leads to or is rather a consequence of obesity.

I hope this helps.
Maybe a visit to a dietician would help.