Please also explain how and why everything goes back to normal when I cut fructose out entirely. I am an quite serious - I do not allow even trace amounts in sauces and mayo and the like, nor in hidden sources such as "agave nectar" (which is 50-90% fructose).
Oh and BTW, I eat TONS of pasta, saturated fat (including butter), plants, and a really nice steak every month. I pour heavy whipping cream into my coffee every morning (not the usual trash, but the fancy expensive stuff free of polysorbate 80 and carrageenan.)
Unless you're eating a fresh strawberry that hasn't been mutilated in a blender (and even then, not too many all at once), fructose makes you fat because it messes with your appetite regulation in the bad direction. Even a little fructose makes you hungry.
Dietary fat (saturated or otherwise) does the exact opposite: all other things being equal, it makes you feel sated.
Don't just take my experience over the last ten years into account - here's a leading endocrinologist that's overturning decades of dogma. He'll set you right: https://www.youtube.com/watch?v=dBnniua6-oM