Question

Which disease reduces bone density and causes the bones to become brittle?

Answer 1

osteoporosis--"a medical condition in which the bones become brittle and fragile from loss of tissue, typically as a result of hormonal changes, or deficiency of calcium or vitamin D."

Think of that air chocolate that Hershey made with the bubbles in it
"Hershey air delights"
The bones are like that

Answer 2

Osteoporosis. Hopes this helps!! :)