You can stress methabolism by fasting and rotating macros within the food selections here. I dunno, I am a sucker for any nutritionist that doesn't announce that fruit is a devil, and that you gotta really suffer for a few months before you, like, magically get better. And if you do not, you are ZE LOZER. I kindda tired of the approaches that are militaristic and domineering and favor those who like butter and bacon.So yes while you can suffer from to much dietary stress, I believe it is also possible to suffer from too little dietry stress. If you've fucked your metabolism, get on peat for 6 months to a year, I'm behind ya all the way. but once you've finished rehab/ holiday get back to work, build that sexy metabolism up, give it muscles, make it a beast that can handle anything.
For sure avoid all the anti nutrients, toxins and toxic fats you can for the rest of your life. but you don't have to protect your thyroid from doing work, you don't have to sit in an optimal temp range all day, you don't have to make sure you only eat proteins with carbs because it stress your body otherwise, you don't have to go on a hormonal witch hunt, once you've got every thing normalised.