Your Eyes Are a Window: 10 Warning Signs of Nutrient Deficiencies You Can't See on a Blood Test

7. Difficulty Distinguishing Colors: Vitamin B12 and Thiamine Deficiency

Has a loved one ever pointed out that blue and green seem to blend together for you? Subtle changes in the ability to tell colors apart—especially in low light—can, in some cases, hint at low levels of vitamin B12 or thiamine. These vitamins are central to healthy nerve function, a necessity for the “wiring” that brings clear, accurate color perception to the brain. Color confusion isn’t especially common, but as we age or shift to more plant-based eating styles (vegan, vegetarian), B12 and thiamine can drop. Fortified cereals, dairy, and nutritional yeast become gentle allies for keeping color vision vibrant. If you or someone you care about notices new struggles with color sorting, think of it as your eyes asking for a little extra support, not as a cause for alarm. A bit of attention goes a long way.

8. Light Sensitivity: Magnesium and Vitamin B2 Deficiency

Does bright sunlight or office lighting bother your eyes more than it used to? Heightened sensitivity to light, known as photophobia, can have simple causes like screen exposure but may also reflect a shortfall in magnesium or riboflavin (B2). These nutrients are champions for nerve health and energy production, calming the ways our eyes react to intense light conditions. Migraines, fatigue, and certain medications can also increase light sensitivity, but nutrition is a factor worth exploring. Chia seeds, almonds, dark leafy vegetables, and whole grains deliver magnesium and B2 to busy bodies and tired eyes. No need to eliminate all brightness—just give your routine a small boost and watch for improvements. This gentle approach fits busy lifestyles, fostering both comfort and resilience in your daily view of the world.