Losing weight is an effective treatment for type 2 diabetes, as well as a prudent preventive measure. Beliefs that it's harder to lose weight when diabetic are unfounded.
The true promise of ageing research is that rather than tackling individual diseases one at a time, a single drug to treat ageing would treat all of the diseases that arise in old age, at once.
Metformin has been used to treat diabetes since the late 1950s. It is now on the World Health Organisation's List of Essential Medicines needed for a basic health care system.
There is an increasing focus on alternative treatment strategies, developed to treat other diseases and conditions but re-purposed to tackle TB.