I learned something very important from my many TCM doctors (acupuncture). They would feel my belly, and tell me it was cold, even though I was looking fat and overfed. They also told me that my pulse was too fast and I was probably feeling overwhelmed.
They were right: I was feeling overwhelmed and my belly was cold because I was anxious.
Filling the belly with warmth took a lot of meditation, focus, stretching, and work on my habitual thoughts.