Ok starting with https://dannyroddy.substack.com/p/bioenergetic-basics-7-where-to-start
At 3m15s video cites the book "Hypothyroidism The unsuspected Illness"
Broda Barnes Basal metabolic rate test:
Measure underarm temperature up waking and in the afternoon.
Test suggests temp should be 97.8F upon waking, and afternoon should
rise to 98.6F.
I like specific numbers, even if they're averages, caveats etc. Also appreciate the detail about meal temperature.