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Eat stuff, exercise, measure results, adjust.

This stuff is extremely individual, unless we're talking extremes. Just do whatever makes your favorite KPI trend in the direction you want. Experiment. The rest is bullshit.

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We don't have many biomarkers that can be measured cheaply and say something about your expected remaining healthspan.

Don't weight and bodyfat% have high correlation to lifespan? You can get a good enough scale for both for pretty cheap.

Fitbits and such also measure resting heart rate for cheap. As far as I've heard, that correlates well to lifespan as well.

You can control your weight and bodyfat reasonably well on a diet that consists solely of Twinkies, so only measuring those won't tell you much about the quality of your diet.

Exactly, find what suits you. I'm having great results with a low carb diet (been even keto for a period) but I'm not 100% sure it works for all.

Worked great for me too, though I didn't have to lose a massive amount of weight (8kg). Just cutting back on sugar itself already does a ton -- nothing more than an addiction. :(

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