I believe it’s froth like not a few bubbles so I wouldn’t read into that much. Your bloodwork tells the story. Your numbers are what I used to have before my radical nephrectomy. I would love to have your numbers.
Focus on eating good and enough. Sometimes we don’t eat enough. Drink plenty of water. Cutting out sugar is great but don’t become hypoglycemic by not eating enough. Get protein from food other than the bars if you can. Whole foods.
I think you have nothing to be worried about. You are watching your numbers and being seen by a dr. You are ahead of the game. There are many people who don’t know what their numbers are as they don’t get regular bloodwork. You are taking care of yourself. Keep it up. My only suggestion is to add exercise. Not sure how old you are but exercise, even a 30 minute walk a day, has tremendous benefits particularly as you age. Weight training of some sort is essential for your bones as you age. Women form osteoporosis quickly as we age.
Getting old is fun. 😂 all you can do is take care of your body the best you can.