Certain nutrient deficiencies can cause people to feel unwell without showing obvious symptoms. As people age, their bodies absorb key nutrients less efficiently. A physician notes that vitamins and minerals are crucial for the body's cells to function properly. Two specific deficiencies are highlighted as particularly common.

Further information is available on the effects of these deficiencies, including their impact on mood. A discussion on the topic breaks down the warning signs and what to discuss with a doctor.

Details on common deficiencies and their symptoms can be found through the Aging Untold hosts and a board-certified physician's insights.