I feel terrible when I'm weak
This has always been an issue with me, with no solution, until I - quite recently - discovered I had a gluten-allergy.
Meaning I could either eat a lot, or almost nothing, and still extract almost zero food-value from whatever I consumed.
Meaning zero fat, little bulk, and very low energy.
Meaning being always cold if the ambient temperature fell below 70F.
Meaning having no cushioning to protect from damage.
Strength - of the physical type - can only happen in the presence of fuel.
A minor point, perhaps, but something to consider.
I increased my body weight by 25% once I removed gluten from my diet.
Muscle and fat, together, makes you feel goooooood