Which of the following statements is true? a. People who get more light exposure early in the day have lower BMIs. b. Light exposure in the afternoon can help with weight management. c. People need light exposure of around 100 lux, and higher levels do not bring added benefits. d. People who get more light exposure in the late afternoon have lower BMIs.
Added by Sandra G.
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Statement a: This statement suggests a correlation between early morning light exposure and lower BMIs. There's no definitive scientific consensus on this specific claim. Statement b: This statement proposes that afternoon light exposure aids weight management. Show more…
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The video describes a study that concludes that children who "don't get enough sleep are at a 20% higher risk for obesity." The video says one reason for this association between lack of sleep and obesity might be because those who get less sleep are more fatigued during the day leading to poorer food choices. Describe some other possible explanations for why these two variables might be related. (a). Students who get less sleep tend to be ones who do not focus on health-promoting activities such as sleep and healthy eating. (b). The connection between less sleep and obesity is likely a coincidence. (c). Students who get less sleep may also get less exercise perhaps because they are tired or because whatever is leading them to get less sleep (homework?) also leads them to have less free time to exercise. Getting less exercise might also lead to more obesity. (d). Getting less sleep causes the body to retain fat. (e). Students who get less sleep are awake more during the day, providing more time and opportunity to eat.
Juhi S.
In Data 4.1 on page 258, we examine a study in which mice were randomly assigned to either a normal light/dark cycle or to have a light on around the clock. According to the paper describing that study, "The global increase in the prevalence of obesity and metabolic disorders coincides with the increase of exposure to light at night." The study is examining whether light at night plays a causal role in the obesity epidemic. In Data 4.1, we examine the effect of the different light conditions on body mass gain after three weeks. In fact, the actual experiment lasted 8 weeks and examined many additional variables. The data referenced here are available in LightatNight8weeks. Some of the variables are summarized in the following table. Variable Name Variable Description Condition Treatment group (Light or Dark) BMGain Change in body mass (in grams) after 8 weeks Corticosterone Blood corticosterone level (a measure of stress) DayPct Percentage of calories consumed during the day Consumption Average daily food consumption (in grams) GlucoseInt Glucose intolerant at end of study? (Yes or No) Activity A measure of physical activity level Higher blood corticosterone levels indicate greater physiological levels of stress. Find and interpret a 90% confidence interval for the difference in mean corticosterone levels between mice with a light on and mice in darkness. Does the confidence interval allow us to conclude that there is a difference in mean corticosterone levels between the two groups? If so, which group has higher mean levels?
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Danielle A.
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