I have a machine that measures body fat, visceral fat, bone mass, muscle mass, percentage water. I treated myself to it as a Christmas present. I'm not claiming it's 100% accurate, but my son had these calculations done as part of a health check paid for by his health insurance company and my machine was pretty close to his results.
So a good enough guide for me, If you lived close to me I'd be happy to let you use it. If you want to know more just PM me.
Apple and banana are full of sugar, as are many fruits. Some muesli too. You need to up your protein, eggs, cheese, and good quality meat. Nuts too. Instead of fruit, eat more vegetables. Tonight's tea for us was chicken Kiev, cauliflower mash, broccoli and green beans - good sized portions too. Then raspberries from the garden with cream. Berries generally have less sugar than other fruits.