Janine was very active throughout her early adulthood and maintained a very high fitness level. if she wants to maintain this fitness level throughout her middle adulthood, how might her participation in physical activity and exercise be impacted? a. janine should reduce the amount of time she spends exercising because it is easier to maintain fitness levels as you age. b. janine should keep her current exercise program because, once a high level of fitness is reached, it never changes. c. janine should increase the intensity or length of her exercise programs because it is more difficult to maintain high fitness levels as you age. d. janine should stop exercising completely because it is not safe for middle-aged adults to exercise.

Samuel is a 63-year-old single man who works full time in a food processing plant. he has a history of esophageal cancer, which was treated successfully with anti-cancer drugs and surgery four years ago. his weight had been stable at 135 pounds until 6 months ago. since then, he has experienced an involuntary weight loss of 10 pounds. he complains of a poor appetite and being overly weak, tired, and irritable. he also complains of cracks at the corners of his mouth and a chronic sore throat, which concerns him, given his cancer history. his usual diet is fairly consistent. he states that he rarely eats breakfast because he starts work at 6 a.m. he eats two deli meat sandwiches, "usually pastrami or salami," and a soda at 10 a.m., and may eat a candy bar in the afternoon when he gets off work. he often prepares and eats a frozen dinner or pizza at home in the evening and routinely drinks "about four or five beers" before going to bed. occasionally, he cooks roast and mashed potatoes for dinner and may have cereal with milk for a snack before bed. he rarely eats vegetables or fruit. 1. considering samuel's alcohol consumption, which b vitamin may he be deficient in? a. pantothenic acid b. niacin c. riboflavin d. biotin e. thiamin