While you're here- Waive your Magic Wand
I'm cheating. I'm going with human sustainability. The big idea is mostly about removing things that make us sick, potentially shorten our lives and certainly reduce the quality of our lives by limiting what we can do.
Odds are very good that doing the following would allow you to cut back on the number of medications you take, maybe even eliminate all of them. I'm 56 and need no medication. Ditto for my 50 year old wife. No medications could lead to financial sustainability, saving hundreds of thousands not spent on prescriptions.
1. Cut carb/sugar consumption
There's a saying that meat, eggs and dietary fat get blamed for what sugar causes. Google it.
2. Cut processed food
Processed foods are obesogenic and sky high in Omega 6 fatty acids. Omega 6 promotes inflammation and causes other problems.
3. Skip breakfast
Confining eating to a 6-8 hour window per day promotes autophagy and insulin sensitivity and reduces inflammation. If you eat protein and fat you will be less likely to get hungry. Making it to noon with just black coffee is very easy when you don't eat carby food that burns off quickly.
4. Lift weights
We naturally start to lose muscle mass around 30 and the loss accelerates as we age. This leads to frailty which means being able to do less of what we want to do and need to do. Lifting weights is life extending with greatly improved quality of life. That picture is of Charles Eugster, he's 93 here.