And if so, how exactly? What's the precise relationship?
What I mean to say is, if certain foods increase or decrease the metabolic rate is it simply that some foods tax free thyroid and increase your requirements, therefore leaving thyroid for energy generation at a deficit, leading to tiredness, poor digestion, stress, aging etc?
I started experiencing some great leaps forward by simply taking my pulse more often and finally becoming convinced that when I eat muscle meat or pufas my metabolic rate appears to decrease quite significantly (i.e. my pulse drops - 80ish is about where I have it at the moment, but it goes below 60 if my last meal was a meat meal for example, so I am cutting it out as much as possible).
I feel that my stress levels have significantly dropped, currently relying on fruit and dairy (goat or jersey milk, but cheese from anywhere) in abundance (and quite a lot of starch too, rice mostly; as I can't consume enough fruit in one go to satiate me).
I have to do further experiments with liver and gelatin, to see the effects of these, but so far, simply my relative pulse seems to be a pretty good marker of warmth, wellness, happiness, and so I wonder if my thyroid will simply be performing better meal to meal with the right changes - which obviously is the general theory of Peat eating.
What I'm getting at though is this - why are we always referring to the thyroid and thyroid hormones, when in fact metabolic rate is the less esoteric way of talking about it? Pulse, warmth, energy level, feeling of wellbeing are the signs of a good metabolic rate, and are directly evident without having to refer to markers you need blood tests for to evidence.
I think if we were focussing on eating to align the pulse with the point of symptoms of wellness, this presents an easy approach to self observation and adjustment.