Some fantastic recommendations here for you regarding subs! Taking action is a crucial part though, so I’ll offer my 2c in that area.
In terms of healthy diet & fitness, most of the conventional wisdom out there is complete and utter SH*T. Insulin is a huge driver of fat storage (and fat loss, when used properly) which is part of why both fasting and keto diets work. There are definite benefits to being in a ketogenic/fasted state, one of which is effectively reducing blood sugar and correspondingly dropping insulin.
I’m not a doctor, so I’ll recommend reading all of Dr. Jason Fung’s books on insulin, diabetes, and fasting. If you’re so inclined, his book on cancer prevention ties the previous books all together with more of a long-term health perspective, but it’s not a necessary read for just improving health.
As for lifting etc at the gym, check out the book Body By Science, by Doug MacGuff. Spend an hour a day in the gym if you enjoy it, sure… but results can be achieved with a much lower time spent. It’s like vitamins… no point in taking a 1,500mg pill if your body can only absorb 200mg at a time and you pee out the rest. Minimum effective dose is important.