Explores the changing nutritional requirements from conception through old age.
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A 28-year-old pregnant woman visits the clinic for her first prenatal checkup. Her pre-pregnancy BMI was calculated to be 22.5. Based on the Institute of Medicine (IOM) guidelines, what is the recommended range for her total weight gain during pregnancy?
25-35 lbs (11.5-16 kg)
A BMI of 22.5 falls within the Normal weight category (18.5−24.9). The IOM recommendation for normal-weight women is to gain 25-35 lbs.
Which micronutrient is critical for women of childbearing age to consume prior to conception to prevent neural tube defects such as spina bifida?
Folate (Vitamin B9)
Folate (or folic acid) is essential for DNA synthesis and neural tube closure, which occurs in the first few weeks of pregnancy, often before a woman knows she is pregnant.
During the second and third trimesters of pregnancy, the maternal energy requirement increases to support fetal growth. Approximately how many additional calories per day are recommended during the second trimester?
340 kcal
Standard guidelines recommend an additional ~340 kcal/day in the second trimester and ~450 kcal/day in the third trimester. The first trimester requires no additional calories.
A pregnant patient reports craving and eating non-food substances such as clay, cornstarch, and ice. This behavior is most indicative of which condition?
Pica
Pica is the craving for non-food substances and is often associated with iron deficiency anemia during pregnancy.
Which hormone is primarily responsible for the production of breast milk in the alveolar cells?
Prolactin
Prolactin stimulates milk production. Oxytocin is responsible for the 'let-down' reflex (milk ejection).
A 32-year-old pregnant woman is diagnosed with gestational diabetes. Which dietary modification is most appropriate to help manage her blood glucose levels?
Consuming complex carbohydrates distributed evenly throughout the day
Gestational diabetes is managed by controlling carbohydrate intake (focusing on complex carbs with low glycemic index) and distributing them across meals to prevent glucose spikes. Total elimination of carbs is unsafe (ketosis risk).
The American Academy of Pediatrics (AAP) recommends exclusively breastfeeding for the first 6 months. During this period, which supplement is routinely recommended for breastfed infants to prevent rickets?
Vitamin D
Breast milk is low in Vitamin D. The AAP recommends a supplement of 400 IU of Vitamin D daily for exclusively breastfed infants.
A mother asks when she should introduce solid foods to her infant. Which of the following developmental signs indicates the infant is ready for complementary foods?
The extrusion (tongue-thrust) reflex has diminished and the infant can sit with support
Physiological readiness for solids (typically 4-6 months) is marked by the disappearance of the extrusion reflex (which pushes food out) and the ability to hold the head up and sit with support.
Why is cow's milk NOT recommended for infants under 1 year of age?
It has a high renal solute load and can cause intestinal bleeding
Cow's milk contains high protein and mineral levels (high renal solute load) that stress immature kidneys and can cause GI bleeding/iron deficiency. It is also low in iron and Vitamin C.
A 9-month-old infant is being fed a variety of table foods. Which food should be strictly avoided due to the risk of botulism?
Honey
Honey may contain Clostridium botulinum spores, which can colonize an infant's immature gut and cause botulism.
