By strengthening the muscles of the back and abdomen, resistance training can improve posture.

Answer to #1

TRUE

Answer to #2

 Young people often drink cola in place of milk or calcium-fortified juices. They don't get the recommended amounts of calcium and vitamin D to attain the maximum bone density.
 Cola is preserved with phosphoric acid, which may cause the bones to release more calcium instead of retaining calcium. This can lead to bone loss as well.

Answer to #3

TRUE

Answer to #4

Table C8-2 lists risk factors for osteoporosis. Both smoking and low body weight are considered modifiable risk factors for osteoporosis. If she is not eating enough to maintain her weight, she is also not likely getting enough vitamins and minerals to support the health of her bones. She could also use weight-bearing exercise to keep her bones strong while avoiding gaining body fat.

Answer to #5

When offered a delicious smorgasbord,people overeat, often without awareness. They are responding toexternal cues. With around-the-clock access to rich, palatable foods, we eat more andmore often than in decades pastand energy intakes have risen accordingly.Overeating also accompanies complex human sensations such as loneliness,yearning, craving, addiction, and compulsion. Any kind of prolonged stress can alsocause overeating and weight gain. People who are overweight or obese may be especially responsive to such influences. People may also overeat in responselarge portions of food. In a classic study,moviegoers ate proportionately more popcorn from large buckets than from small bags. The effect may also generalize to children, who askedfor bigger portions of cereal when given bigger bowls than when given smaller bowls;they ate more and wasted more from bigger bowls, too.

Answer to #6

Vitamins A, K, and C as well as magnesium and omega-3 fatty acids are also important for bone health. Vitamin A is needed for adequate bone remodeling to maintain the strength of the bones. Vitamin K, which tends to be found in the same green leafy vegetables that contain calcium, is necessary for the production of a key bone protein. Vitamin C, magnesium, and omega-3 fatty acids are needed for maintaining bone density. Magnesium may also help to maintain bone mineral density since it influences calcium use in the body.