Somehow it always boils down to reduction in sugar intake and switching it with a ketogenic diet. At least now we know that 40s-50s is where it is the most crucial for the ketone, so sugar intake must be reduced here, or you better start taking ketone supplements (though I wonder if taking such suppliments might have side effects other than making you lose weight).
Either way, better start having that greek yogurt with nut muesli in the morning. It is really delicious to begin with.