I don’t think the tonic itself is bad for diabetics, if you know the carbs in the maple syrup and bolus properly. I think trying to detox using ONLY that tonic is bad not only for diabetics but for anyone.
You can detox and get back into healthier habits without drinking a concoction like the one you described.
Plain water is the best cleanser. It’s used wordwide, been in use for centuries, plentiful where we live and is renowned as a universal cleansing agent.
Rather than go through a ritual involving an untested tonic, make up your own ritual to start healthier habits. Start with drinking water as your only beverage (or the tonic) but also eat something, following the plan described by Kristin, below. It uses stuff that is proven to be healthy for you.
Starting to eat healthier is not easy since we’re surrounded by junk all day long. One way to start is to surround yourself with healthy food. If you don’t have junk in the house, you won’t eat it. When you are out and about and find yourself in a place selling a lot of junk either leave, or buy a bottle of water and a piece of fruit, if there is any, and leave. Fast.
One more thing. Two, actually. One - Always eat breakfast. If you have to leave the house before having breakfast, eat something first. Two - Pack your own lunch.
Here’s to healthy eating.