Weight Management and Special Populations
What this domain tests
Weight Management and Special Populations tests safe deficit design, preservation of lean mass, and appropriate referral for pregnancy, older adults, diabetes, youth, and plant-based clients. The exam rewards conservative, evidence-based recommendations.
Core rules
- A moderate deficit of about 300–750 kcal/day is common; a loss rate of 0.5–1% of body weight per week is a practical target.
- Preserve lean mass with resistance training and adequate protein, often 1.2–1.6 g/kg/day during weight loss.
- Pregnancy and lactation require medical oversight and no intentional weight loss; refer to an RD or physician.
- Older adults need attention to protein (often 1.0–1.2 g/kg/day), vitamin D, calcium, and resistance exercise to reduce sarcopenia risk.
- Diabetes, hypertension, kidney disease, and eating disorders require medical nutrition therapy or coordinated care; you provide general education only.
- Youth weight management should be family-based and non-restrictive; avoid stigmatizing language.
- Vegan clients need attention to vitamin B12, iron, zinc, calcium, iodine, and omega-3 fatty acids.
Worked example
A 90 kg client wants to lose weight. A 0.5–1% weekly target is 0.45–0.9 kg/week. Using a 500 kcal/day deficit from an estimated TDEE of 2,600 kcal gives 2,100 kcal/day, with 1.2–1.6 g/kg protein (108–144 g/day) and two resistance sessions weekly. The reasoning: the deficit is moderate, protein and lifting protect lean mass, and the rate is sustainable.
Traps that cost marks
Prescribing very-low-calorie diets without supervision, recommending weight loss during pregnancy, ignoring medication interactions, and using restrictive language with youth.