plenty was written about optimizing the heat retention, bed bottle, clothes.
But what about boosting the heat source?
Let's examine why two people, 1 man vs 1 woman, same age, height, body weight and similar BMI have different thermal requirements.
I understand that I may trigger some battle of the sexes hate flames, but I didn't design the human body, so don't blame me.
Check with your doctor to validate your own stats.
Men generally have a high protein and high iron diet.
Women generally have a low protein, high carbs and sugar diet.
Women also regularly loose some iron on the 28 cycle.
Do you guys hate and want me to shut up yet? ok I'll continue anyway.
Since you are aware that your body generates the heat source, let's examine why?
The human body is like a furnace or fireplace. You toss a fuel source and it will burn to generate heat. but to retain heat, a furnace and fireplace have iron, insulation and bricks, that continue to store and radiate heat.
People that have a higher than avg body fat % (women?) get cold faster. Fat is a fuel source, but it is a lousy insulation and retainer of heat.
People that have a higher than avg iron % (men?) are always heating up. Iron is the body's insulation, like a Thermos or the inside of a kitchen oven.
My wife - same problem. surprised? no.
Her Dr ran a blood test and put her on a vitamin regiment. you can look up all the dark green leaves spinach and low-fat meat protein (filet mignon/salmon) foods.
problem is not fully solved, but she is comfortable wearing shorts in 72F weather, whereas before, she was freezing in the July/Aug heat wave under a down comforter wearing layers of PJs.
It's not a quick solution or shortcut like all the previous posts. We're talking about changing your food intake for about 9 months before your blood test results will improve.
Look up the Red Cross blood donation centers, they have a list of recommended high iron foods. Most Americans do not like the flavor, but beef liver is very high on iron.
Again - check with your doctor, because beef liver is also super high in bad cholesterol.
but on the healthy side - filet mignon is lean in fat, high iron and protein, spinach and broccoli are a good iron source if you make them part of your daily meals.