Functional Foods and Nutraceuticals — MCQs
All are true regarding 'Positive health' in today's world except:-
All are sources of free radicals except -
Folic acid deficiency is precipitated by:
Which of the following statements is correct regarding lactic acid, sorbic acid, and sulphurous acid?
Maximum concentration of vitamin A is found in which organ?
Which of the following statements about folic acid and vitamin B12 is NOT true?
Which of the following is false about the selection of essential drugs?
All of the following are water-soluble antioxidants except?
Consider the following statements about content/yield of 100 gm of some foodstuffs: 1. Fat content of Bengal gram is less than that of maize 2. Protein content of maize is more than that of rice 3. Calorie yield of fish and egg is same Which of the statements given above is/are correct?
Which of the following trace elements has vitamin E-like action?
Functional Foods and Nutraceuticals Indian Medical PG Practice Questions and MCQs
Question 1: All are true regarding 'Positive health' in today's world except:-
- A. Involves adaptive behavioral changes for future challenges
- B. Body and mind at peace
- C. Influenced by social, economic and cultural factors
- D. Positive health is considered an illusion in changing environments (Correct Answer)
Explanation: ***Positive health is considered an illusion in changing environments*** - This statement is incorrect because the concept of **positive health** emphasizes **resilience** and adaptability, suggesting that individuals can achieve and maintain well-being despite changing environments. - Far from being an illusion, positive health frameworks aim to help individuals thrive by developing strategies to **cope with challenges** and changes. *Involves adaptive behavioral changes for future challenges* - **Positive health** encourages individuals to **proactively adapt** their behaviors and attitudes to better prepare for and manage future difficulties. - This concept aligns with building **resilience**, promoting well-being, and fostering personal growth in the face of new challenges. *Body and mind at peace* - A key aspect of **positive health** is achieving a state of **harmony** and balance between one's physical and mental well-being. - This involves practices and mindsets that promote a sense of **calmness**, contentment, and overall peace. *Influenced by social, economic and cultural factors* - **Positive health** is recognized as being multidimensional and deeply affected by various external elements, including **social support systems**, economic stability, and cultural norms. - These factors can significantly impact an individual's ability to achieve and maintain optimal health and well-being.
Question 2: All are sources of free radicals except -
- A. Glutathione (Correct Answer)
- B. Nitric oxide
- C. Myeloperoxidase
- D. Fenton's reaction
Explanation: ***Glutathione*** - **Glutathione** is a powerful **antioxidant** that helps to neutralize free radicals, not produce them. - It plays a crucial role in protecting cells from **oxidative damage**. *Nitric oxide* - **Nitric oxide (NO)** is a free radical itself, containing an unpaired electron. - It can lead to the formation of other reactive nitrogen species, contributing to **oxidative stress**. *Myeloperoxidase* - **Myeloperoxidase (MPO)** is an enzyme primarily found in neutrophils that produces powerful free radicals like **hypochlorous acid (HOCl)**, a highly reactive oxidant. - This process is essential for the immune system's ability to kill invading pathogens. *Fenton's reaction* - **Fenton's reaction** is a key chemical process that generates highly reactive **hydroxyl radicals (•OH)** from hydrogen peroxide in the presence of ferrous iron (Fe2+). - This reaction is a significant source of oxidative damage in biological systems.
Question 3: Folic acid deficiency is precipitated by:
- A. Phenytoin
- B. Trimethoprim
- C. Cyclosporin
- D. Methotrexate (Correct Answer)
Explanation: ***Methotrexate*** - **Methotrexate** is an **antimetabolite** that acts as a **folic acid analog**, competitively inhibiting **dihydrofolate reductase (DHFR)**, the enzyme responsible for converting dihydrofolate to tetrahydrofolate. - This inhibition blocks **DNA synthesis** and cell proliferation, leading to the therapeutic effects of methotrexate but also causing **severe folic acid deficiency** by preventing the formation of its active form. - **Most direct and potent** cause of drug-induced folate deficiency, requiring **leucovorin rescue** in high-dose therapy. *Phenytoin* - **Phenytoin** is an **antiepileptic drug** that **interferes with folate absorption** by inhibiting **intestinal conjugase enzyme** and affecting folate transport mechanisms. - Chronic use can lead to **clinically significant folate deficiency** and **megaloblastic anemia**, making it an important recognized cause. - However, compared to methotrexate, the mechanism is **indirect** (absorption interference) rather than direct enzyme inhibition, and the onset is more gradual. *Trimethoprim* - **Trimethoprim** also inhibits **dihydrofolate reductase**, but its affinity for **bacterial DHFR** is significantly higher (thousands of times) than for human DHFR. - While prolonged high-dose use can rarely cause **folate deficiency** in humans, it is much less common and clinically significant than with methotrexate or phenytoin. *Cyclosporin* - **Cyclosporin** is an **immunosuppressant** that primarily acts by inhibiting **calcineurin**, thereby preventing the activation of **T-lymphocytes**. - Its mechanism of action does not directly involve **folic acid metabolism**, and it is **not known** to cause folic acid deficiency.
Question 4: Which of the following statements is correct regarding lactic acid, sorbic acid, and sulphurous acid?
- A. Lactic acid and sorbic acid only
- B. Sorbic acid and sulphurous acid only
- C. None of these substances are preservatives
- D. All of these substances are preservatives (Correct Answer)
Explanation: ***All of these substances are preservatives*** - **Lactic acid**, **sorbic acid**, and **sulfurous acid** are all commonly used as food preservatives due to their antimicrobial properties. - They inhibit the growth of bacteria, yeasts, and molds, thereby extending the shelf life of food products. *Lactic acid and sorbic acid only* - This option is incorrect because **sulfurous acid** is also a widely recognized food preservative. - While lactic and sorbic acids are preservatives, excluding sulfurous acid makes this statement incomplete. *Sorbic acid and sulphurous acid only* - This option is incorrect as **lactic acid** is also a food preservative. - Lactic acid is naturally present in fermented foods and is added to many products to prevent spoilage. *None of these substances are preservatives* - This option is completely incorrect as **lactic acid**, **sorbic acid**, and **sulfurous acid** are all established and widely utilized food preservatives. - They play crucial roles in food safety and preservation.
Question 5: Maximum concentration of vitamin A is found in which organ?
- A. Liver (Correct Answer)
- B. Kidney
- C. Lung
- D. Heart
Explanation: ***Liver*** - The **liver** is the primary organ for **storage of vitamin A** (retinyl esters), accounting for 90% of the body's total vitamin A content. - **Hepatic stellate cells** within the liver are specialized for storing the majority of this fat-soluble vitamin. *Kidney* - The **kidney** plays a role in **vitamin D metabolism** and excretion, but not significant vitamin A storage. - While it helps regulate blood levels of various substances, it does not accumulate large quantities of vitamin A. *Lung* - The **lung** does not serve as a major storage site for **vitamin A**. - Its primary functions are related to **gas exchange**, not nutrient storage. *Heart* - The **heart** is responsible for **pumping blood** throughout the body and has minimal involvement in vitamin A storage. - It utilizes certain vitamins for its metabolic processes but does not act as a primary reservoir.
Question 6: Which of the following statements about folic acid and vitamin B12 is NOT true?
- A. Vegetarians have vitamin B12 deficit
- B. Deficiency of both causes megaloblastic anemia
- C. Recommended daily allowances for Folic acid is 1000 micro grams (Correct Answer)
- D. Both are required for DNA synthesis
Explanation: ***Recommended daily allowances for Folic acid is 1000 micro grams*** - The **recommended daily allowance (RDA)** for folic acid in adults is typically around **400 micrograms (mcg)**, not 1000 mcg. Pregnant women may require a higher intake of 600 mcg. - An intake of 1000 mcg (1 mg) is closer to the **tolerable upper intake level (UL)** for folic acid, above which there is a risk of masking a vitamin B12 deficiency. *Both are required for DNA synthesis* - Both **folic acid** (as tetrahydrofolate) and **vitamin B12** (as methylcobalamin) are essential coenzymes in the **one-carbon metabolism pathway**. - This pathway is crucial for the synthesis of **purines and pyrimidines**, which are the building blocks of **DNA**. *Vegetarians have vitamin B12 deficit* - **Vitamin B12 (cobalamin)** is found almost exclusively in **animal products** (meat, fish, eggs, dairy). - Therefore, individuals following a strict **vegetarian or vegan diet** are at a significant risk of developing a vitamin B12 deficiency if they do not consume fortified foods or supplements. *Deficiency of both causes megaloblastic anemia* - Both **folic acid deficiency** and **vitamin B12 deficiency** impair DNA synthesis, which leads to arrested maturation of red blood cell precursors in the bone marrow. - This results in the production of **large, immature red blood cells** known as **megaloblasts**, clinically manifesting as **megaloblastic anemia**.
Question 7: Which of the following is false about the selection of essential drugs?
- A. Cost to benefit has to be considered
- B. Fixed drug combination is preferred over single drugs (Correct Answer)
- C. An adequate safety profile needs to be established
- D. Disease prevalence is considered
Explanation: ***Fixed drug combination is preferred over single drugs*** - The statement that **fixed-drug combinations (FDCs)** are preferred over single drugs for essential drug selection is false. Generally, **single drugs are preferred** to allow for individual dose adjustments and minimize potential adverse effects from unnecessary components. - FDCs are only considered essential when they offer specific advantages, such as **improved adherence** (e.g., in tuberculosis treatment) or a **synergistic effect** not achievable with individual drugs. *Cost to benefit has to be considered* - This statement is true; the **cost-effectiveness** and **cost-benefit ratio** are crucial factors in selecting essential drugs. - Essential drugs aim to provide the most public health benefit at an **affordable cost**, ensuring access for a broad population. *An adequate safety profile needs to be established* - This statement is true; essential drugs must have a **well-established safety profile** with acceptable risks. - The benefits of the drug must significantly outweigh its potential harms, with minimal serious **adverse reactions**. *Disease prevalence is considered* - This statement is true; essential drugs are selected based on their ability to address the **most prevalent diseases** and health needs of a population. - Prioritizing drugs for common conditions ensures that public health resources are effectively allocated to where they are most needed.
Question 8: All of the following are water-soluble antioxidants except?
- A. uric acid
- B. Polyphenols
- C. Carotenes (Correct Answer)
- D. Ascorbate
Explanation: ***Carotenes*** - **Carotenes** are **lipid-soluble** antioxidants that are typically found in cell membranes and lipid components of the body. - They protect against **lipid peroxidation**, which is damage to cellular membranes caused by free radicals. *Ascorbate* - **Ascorbate** (Vitamin C) is a well-known **water-soluble** antioxidant that readily donates electrons to neutralize free radicals in aqueous environments. - It plays a crucial role in regenerating other antioxidants, such as **alpha-tocopherol (Vitamin E)**. *Uric acid* - **Uric acid** is a potent **water-soluble** antioxidant present in high concentrations in the plasma. - It scavenges various reactive oxygen species and reactive nitrogen species, especially in the **extracellular fluid**. *Polyphenols* - **Polyphenols** are a large group of **water-soluble** compounds found in plants that act as antioxidants. - They reduce oxidative stress by **scavenging free radicals**, chelating metal ions, and inhibiting enzymes involved in radical generation.
Question 9: Consider the following statements about content/yield of 100 gm of some foodstuffs: 1. Fat content of Bengal gram is less than that of maize 2. Protein content of maize is more than that of rice 3. Calorie yield of fish and egg is same Which of the statements given above is/are correct?
- A. 2 and 3
- B. 2 only (Correct Answer)
- C. 1 and 2
- D. 1 only
Explanation: ***Correct Answer: 2 only*** **Statement 2 is correct:** Protein content of maize (9-10g per 100g) is indeed more than that of rice (7-8g per 100g). This is an important nutritional distinction for dietary planning. **Why other statements are incorrect:** *Statement 1 is incorrect:* Fat content of Bengal gram (chickpea) is approximately 6g per 100g, while maize (corn) contains about 4.7g per 100g. Therefore, Bengal gram actually has **more** fat content than maize, not less. This makes statement 1 false. *Statement 3 is incorrect:* Calorie yield varies significantly between fish and eggs. Fish provides 100-200 kcal per 100g depending on the type (lean vs. fatty fish), while whole eggs provide approximately 155 kcal per 100g. The variability in fish calorie content makes it inaccurate to state they are "same." **Clinical Relevance:** Understanding macronutrient composition of common food items is essential for providing appropriate dietary counseling and nutritional recommendations in clinical practice. --- *Option A (2 and 3):* Incorrect because statement 3 is false - calorie yields are not the same. *Option C (1 and 2):* Incorrect because statement 1 is false - Bengal gram has more fat than maize. *Option D (1 only):* Incorrect because statement 1 is false, and statement 2 is actually correct.
Question 10: Which of the following trace elements has vitamin E-like action?
- A. Iron
- B. Selenium (Correct Answer)
- C. Copper
- D. Zinc
Explanation: ***Selenium*** - Selenium is an essential component of **glutathione peroxidase**, an enzyme that works alongside vitamin E to protect cells from **oxidative damage**. - Its antioxidant properties are similar to **vitamin E**, as both scavenge free radicals and prevent lipid peroxidation. *Iron* - Iron is vital for **oxygen transport** in hemoglobin and myoglobin, and for cellular respiration as a component of cytochromes. - While essential, iron does not have direct **antioxidant properties** akin to vitamin E; in excess, it can even promote oxidative stress. *Copper* - Copper is a cofactor for several enzymes, including **superoxide dismutase (SOD)**, an antioxidant enzyme, but its primary role is not directly analogous to vitamin E's lipid-soluble antioxidant function. - It also plays a role in **energy production**, iron metabolism, and neurotransmission. *Zinc* - Zinc is crucial for **immune function**, wound healing, and DNA synthesis, acting as a cofactor for over 300 enzymes. - Although it has indirect antioxidant effects by stabilizing cell membranes and reducing oxidative damage, its mechanism and direct action are not considered "vitamin E-like."
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