Maize is pellagragenic due to excess content of
**Core Concept**
Maize, being a cereal grain, is a staple food in many parts of the world. The term "pellagragenic" refers to the potential of a food to cause pellagra, a disease characterized by dermatitis, diarrhea, dementia, and potentially death. The underlying principle being tested is the nutritional content of maize and its relation to the development of pellagra.
**Why the Correct Answer is Right**
Maize is pellagragenic due to its excess content of **lysine deficiency** and **tryptophan deficiency**. Tryptophan is an essential amino acid that serves as a precursor to **niacin (Vitamin B3)**, which is crucial for the synthesis of **NAD and NADP**. These coenzymes play a vital role in various metabolic processes, including energy production and DNA repair. The deficiency of tryptophan and subsequent niacin deficiency lead to the development of pellagra.
**Why Each Wrong Option is Incorrect**
* **Option A:** Lysine deficiency is indeed a characteristic of maize, but it is not the primary reason for its pellagragenic properties.
* **Option B:** Folate deficiency is not directly related to the development of pellagra.
* **Option C:** While a deficiency in certain micronutrients like iron or zinc can cause various health issues, they are not directly linked to the pellagragenic properties of maize.
**Clinical Pearl / High-Yield Fact**
It is essential to note that maize can be made non-pellagragenic by adding **lysine-rich** and **tryptophan-rich** foods like beans, nuts, or dairy products to the diet. This highlights the importance of a balanced diet and the need to consider the nutritional content of staple foods.
**Correct Answer: D. Tryptophan deficiency**