Identifying the Main Symptom: Carotenoderma
The most noticeable and common symptom of high carotene levels, a condition called carotenemia, is a yellow-orange skin pigmentation known as carotenoderma. This discoloration occurs because carotene is a fat-soluble pigment that gets deposited in the outermost layer of the skin, the stratum corneum. The pigmentation is typically most prominent in areas with thicker skin or more sweat glands.
Key areas affected by carotenoderma
- Palms and soles: The yellowing is most apparent on the hands and feet due to the thickness of the skin in these areas.
 - Nasolabial folds: The skin around the nose and mouth often shows a distinct yellowish tint.
 - Forehead and nose tip: Other areas of the face may also show some discoloration.
 
One of the most important aspects of diagnosing diet-induced carotenemia is confirming that the sclerae (the whites of the eyes) are spared. This feature is the primary way to differentiate carotenemia from jaundice, a more serious condition associated with liver problems that causes the whites of the eyes to turn yellow.
Causes of Elevated Carotene Levels
While excessive consumption of carotene-rich foods is the most frequent cause, high carotene levels can also be linked to other health conditions. Understanding the cause is key to proper management.
Primary (Dietary) Causes
Diet-induced carotenemia occurs from the prolonged, excessive intake of carotene. It is particularly common in infants and young children, but can affect adults as well.
Foods particularly high in carotene include orange and yellow fruits and vegetables, dark leafy greens, eggs, butter, and cow's milk.
Secondary (Metabolic) Causes
In some cases, carotenemia is caused by an underlying medical condition affecting carotene metabolism or excretion. These include hypothyroidism, diabetes mellitus, liver and kidney disease, and anorexia nervosa.
Comparing Carotenemia with Jaundice
Misdiagnosis between carotenemia and jaundice is common. The table below outlines key differences:
| Feature | Carotenemia (High Carotene) | Jaundice (High Bilirubin) | 
|---|---|---|
| Skin Color | Yellow-orange, often most noticeable on the palms and soles. | Yellowing of the skin. | 
| Sclera (Whites of Eyes) | Unaffected, remain white. | Yellowed due to elevated bilirubin. | 
| Cause | Excessive dietary intake of carotene or metabolic issues affecting its breakdown. | Buildup of bilirubin in the blood due to liver disease, bile duct obstruction, or other medical issues. | 
| Prognosis | Benign and reversible by reducing carotene intake. | Can indicate a serious underlying medical problem. | 
| Blood Tests | Show elevated serum carotene levels with normal liver function. | Show elevated bilirubin levels and often abnormal liver function tests. | 
Management and Outcome
Diet-induced carotenemia is harmless and reversible. Reducing intake of carotene-rich foods will cause the discoloration to fade over several weeks to months. If linked to underlying medical issues, treating that condition is necessary.
Conclusion
Symptoms of high carotene levels (carotenemia) are typically benign and manageable, primarily presenting as yellow-orange skin that spares the whites of the eyes. Most cases result from overconsumption of carotene-rich foods, resolving with dietary adjustments. If the condition persists or other symptoms appear, consult a healthcare provider to rule out underlying metabolic disorders.