शरीराकरिता आवश्यक असणाऱ्या उष्मांक (कॅलरी) गरजेचा अंदाज घेण्यासाठी खालील बाबी विचारात घेणे आवश्यक आहे :

The correct answer is Option B (Only (a) Statement is correct).

Key Points:
• Correct Option Evaluation: The correct answer is option (2) Only (a) Statement is correct.
• Calorie Requirements & Estimation:
• (a) Physical activity: The level of physical exertion (sedentary, moderate, or heavy work) is the primary determinant of human daily caloric and energy expenditure. (Correct)
• (b) Body size composition: While body mass influences basal metabolic rate, direct dietary guidelines established by ICAR/ICMR primarily tie standard population requirements to physical activity levels.
• (c) Malnutrition: Malnutrition is an outcome or deficiency state, not a determinant used to calculate normal baseline calorie requirements.
• (d) Climate and environment: While ambient temperature affects basal metabolism slightly, standard nutritional committees use physical activity as the definitive benchmark.
• Exam Insight: Nutritional planning in India relies heavily on ICMR expert committee standards for daily energy allowances based on occupation and activity.
• Key Takeaway: Physical activity is the primary factor taken into account when estimating human calorie requirements.