You will need to collect Ambrosia to upgrade your health.
Ambrosia is a bright glowing multicoloured clump of crystals typically found at high points or on top of statues.
You can identify these by looking around areas using your “Far Sight” (press in
) and clicking RT when the ‘Reveal’ trigger appears on screen accompanied by a heavy vibration.
Once you have collected enough Ambrosia you can upgrade your health at The Hall of Gods at the cauldron with a red health bar on.