Very interesting…
Above I posted ‘no other changes of diet’ but was thinking of fatty stuff, whereas in fact at the same time as cutting butter, I did totally cut out our local artisan boulanger’s wonderful wild yeast pain au levain because after daily consumption of it for several years, I felt it was giving me excess stomach acidity - switched to another artis boulanger’s cornbread and my stomach’s been fine for several months. So maybe it was the bread, though OH won’t believe that - she’s his champion and has been exactly the same weight for forty years or so…
Fortunately only drink black coffee, so thankfully no need for butter there (sounds worse tasting than milk) isn’t that what Tibetans do with tea?