Away from diabetes there are also studies that show metformin also has life extending properties.
Unless this person has specifically asked you, I would suggest you stop trying to play doctor for them. They won't thank you for it, only blame you for whatever goes wrong.
I wouldn't tell them to personally give up Metformin.
This is the kind of dumb self-doctoring we have here in Canada with our Indigenous population, where our government is allowing Indigenous wellness healers to prescribe absolutely ridiculous stupid shit to Indigenous people that has no scientific basis whatsoever, and - SURPRISE, SURPRISE - isn't working at all!

However, if diabetes is potentially something that can be put into remission - which, it appears to me it can be - I want to forewarn about the negative properties of Metformin, and encourage a cleaner diet.
One reason why I wouldn't push it with this family member is because he was furious that I may have brought Covid into his house last year because his wife had a sore throat that had NOTHING to do with me.
Both of them eat absolute SHIT diets, and both have health conditions as a result of their diets, and I have no tolerance for unhealthy people accusing me of bringing in Covid, when I can literally contact trace EVERY PERSON I SHARE AIR WITH. I have a mental list of everyone I hung out with over the past 30 days at any given time, and my gym has cameras in it, so I can literally track everyone I'm in contact with.
I go to Wal-Mart once a month to buy a month's supply of food, so I had NOTHING to do with his wife's sore throat, which was a seasonal allergy change, if anything. It wasn't Covid. And whatever it was, it wasn't me who caused it.
I honestly can't stand people like the type of woman in that cartoon, who have a horrible lifestyle, yet would call 9-1-1 on me for not wearing a mask.
This is why I don't invest much emotion in other people's problems - I live in a country of overweight and obese opioid-addicted alcoholics who want to lock me away forever for breathing air, as if I'm the reason they are fat and unhealthy.

However, I DO feel the need to play doctor here for two reasons:
[1] I'm smarter than his doctor. I have no doubt about that.
[2] NOT ONCE in nearly 20 years has his idiot doctor told him that his diabetes can be improved with diet. Not once! And in fact, other than telling him to switch to diet pop, he has NEVER even told him to clean up his diet.
Western medicine may be the best in the world, but it's glorified drug pushing.
They don't want us dead. But they don't want us CURED. The money is in the MIDDLE, and the system is just making me more and more disgusted with it all the time.
I am certain that his diabetes could be managed just through diet. And given how scared he was during Covid, it just makes me wonder why he doesn't care.
Clearly, most people don't want to die - but they also don't want to do ANYTHING, apparently, to be healthy. Except call 9-1-1 on people for breathing air.

Also switch the white rice for basmati rice if you want to be extra.
Tell me all about it.
Is that a lower glycemic rice?
Also, someone said that it's important to always eat rice/carbs with protein. So a bowl of rice alone is a problem, diet-wise.
Is there any truth to that, or is that just Bro Science?
I eat under 100g of carbohydrates daily, so I can't imagine that being a problem, even if I ate it all at once?