8. Nutrition Flashcards Preview

Goljan > 8. Nutrition > Flashcards

Flashcards in 8. Nutrition Deck (33):
1

What's the big difference between anorexia and bulimia?

Body image extremely distorted in anorexia - 60 lb woman

Bulimia - binges

2

Why do people with anorexia and bulimia have amenorrhea?

Decreased GnRH

3

What do people with anorexia die of?

Cardiac problems

4

What acid base disturbance do you get with vomiting?

Metabolic alkalosis

5

What major esophageal complication are bulimics at risk of?

Boeerhave syndrome (+ Mallory Weiss)

6

What BMI means obese?

> 30

7

What is the main complication of obesity?

Hypertension, left ventricular hypertrophy, potential risk of heart failure

8

What kinds of cancer does obesity predispose you to?

Estrogen cancers because adipocytes increase aromatic activity - e.g. breast cancer

9

What's the major function of water soluble vitamins?

Cofactors

10

What does Vitamin A deficiency look like?

Night blindness, failure to thrive, squamous metaplasia (particularly white spots in the cornea)

11

Big game hunter who eats bear liver with headaches?

Hypervitaminosis A (cerebral edema and liver)

12

What is the most common source of vitamin D?

Sunlight

13

Is there vitamin D in breast milk?

No - that's why babies need to be exposed to sunlight

14

Where is vitamin D absorbed in the gut?

Jejunum

15

Where is 1 alpha hydroxylase synthesized?

PCT (stimulated by PTH)

16

What does vitamin D do?

Increase absorption of calcium and phosphate

17

Why do thiazides have a risk of hypercalcemia?

Na and Ca take turns in the DCT but thiazides block reabsorption of Na so Ca is more able to be reabsorbed

18

What is the only hormone that has a receptor on an osteoclast?

Calcitonin

19

Where is PTH's receptor?

Osteoblast

20

When PTH binds to osteoblast what does it release?

IL-1 also called osteoclast stimulating factor

21

How do cytochrome p450 inducers/inhibitors affect calcium levels?

Inducers (e.g. phenytoin, chronic alcohol) cause increased metabolism of vitamin D so it leads to hypocalcemia

22

What is the enzyme of the smooth ER (marker of revved up cyp450)?

Gamma glutamyl transferase

23

What is the most common cause of vitamin D deficiency?

Renal disease (e.g. from diabetes mellitus)

24

What's the most common complication of hypervitaminosis D?

Hypercalcemia --> Calcium stones

25

What is Vitamin E's main function?

1. Maintain cell membranes - prevent membrane peroxidation
2. Neutralizes oxidized LDL (cardio protective)

26

What are the complications of Vitamin E deficiency?

Neurologic symptoms (demyelination of dorsal columns) and hemolytic anemia (membrane damage)

27

What does Vitamin E toxicity look like?

Makes someone anticoagulable (prevents synthesis of K dependent factors)

28

Where does most of Vitamin K come from?

Made by colonic bacteria (some comes from diet but most is made in the GI)

29

What enzyme activates vitamin K?

Epoxide reductase

30

What does vitamin K do?

Gamma carboxylation of coagulation factors - allows calcium to bind to these factors so that they can form a clot (basically form an anchor point)?

31

What does warfarin do?

Block epoxide reductase

32

What's the most common cause of vitamin K deficiency in the hospital?

Broad spectrum antibiotics - wipe out GI bacteria

33

Rat poison is what?

Warfarin