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Chapter 2: Problem 2

Stuc San desc drin authors of the study state Total energy may be a confounder if consumption of sweet drinks is a marker for other dietary factors associated with overweight ... (Pediatrics, November \(2005)\) Give an example of a dietary factor that might be one of the potentially confounding variables the study authors are worried about.

Short Answer

Expert verified
An example of a dietary confounding factor could be the high consumption of fast food, which often comes with sweet drinks and leads to an overall increase in calorie intake.

Step by step solution

01

Identify the main variables in the situation

There are two variables - independent variable (the consumption of sweet drinks) and dependent variable (the risk of being overweight). The total energy intake is a potential confounding variable.
02

Reflect on other potential confounding variables

The authors are worried about other dietary factors, meaning these factors must influence both the consumption of sugary drinks and weight gain. These could include total calorie intake, proportion of diet composed of processed or fast foods, portion sizes, or frequency of dining out.
03

Provide a specific example

Any dietary factor that independently increases both the risk of consuming high amounts of sweet drinks and the risk of being overweight can be considered a confounding variable. For example, higher consumption of fast foods could be a confounding variable. Many fast-food options are high in both sugars (increasing the likelihood of sweet drink consumption) and calories (increasing risk of overweight).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Dietary Factors
Dietary factors play a crucial role in determining our overall health. These factors include the types and amounts of food we consume daily. In the context of the study, dietary factors can influence both sweet drink consumption and weight gain. For instance, a diet high in processed foods and low in fiber may lead to increased consumption of sweetened beverages because processed foods often increase thirst and sugar cravings.
  • Portion sizes: Larger portion sizes can lead to consuming more calories, which can increase the risk of weight gain and encourage sweet drink consumption.
  • Meal frequency: Eating more frequently, especially meals low in nutritional value, can contribute to higher caloric intake over the day.
  • Macronutrient balance: A diet that's imbalanced in proteins, fats, and carbohydrates may result in excess calorie consumption.
Understanding these dietary factors is essential for identifying potential confounding variables in studies about weight gain and sweet drink consumption.
Sweet Drink Consumption
Sweet drink consumption is the intake of beverages that have added sugars, including sodas, energy drinks, and sweetened teas. Such drinks are high in calories but low in essential nutrients. They can lead to increased total caloric intake without providing any satiating effect, often resulting in weight gain.
  • Caloric density: Sweet drinks are packed with calories that are consumed quickly and easily, often without adding to the feeling of fullness.
  • Sugar content: High sugar levels can increase the risk of metabolic disorders and contribute to weight gain, especially when consumed chronically.
  • Accessibility: Sweet drinks are widely available and affordable, making them an easy choice for many, leading to higher consumption rates.
Awareness about the impact of sweet drink consumption is important when considering dietary influences on weight management.
Weight Gain
Weight gain occurs when we consume more energy (calories) than we expend. It is influenced by various factors, including diet, physical activity, and individual metabolism. In the study's context, consumption of high-calorie foods and drinks increases total energy intake, which may lead to weight gain.
  • Energy balance: Maintaining weight requires a balance between calories consumed and calories expended. An imbalance can lead to weight gain.
  • Genetic predispositions: Genetics can influence how our body stores fat and how efficiently it can metabolize food.
  • Lifestyle factors: Sedentary activities, lack of sleep, and stress can all contribute to weight gain by altering metabolism and eating behaviors.
Monitoring weight gain is crucial as it is a risk factor for various health conditions, ranging from cardiovascular diseases to diabetes.
Fast Food Consumption
Fast food consumption refers to the frequent intake of meals typically served quickly, often with high calories, fats, and sugars. This type of diet can result in increased body weight and elevate the risk factors for dietary-related health issues.
  • High calorie content: Fast foods are often rich in fats and sugars, contributing significantly to daily caloric intake and potentially leading to weight gain.
  • Low nutritional value: Fast foods are usually low in essential nutrients, which might increase craving for sweet drinks to compensate for lacking flavors or satisfaction.
  • Convenience factor: The ease of access and quick serving times of fast foods make them a popular option, often replacing healthier meals at home.
Understanding the impacts of fast food consumption helps identify it as a possible confounding variable in studies assessing dietary patterns and health outcomes.

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Most popular questions from this chapter

For each of the situations described, state whether the sampling procedure is simple random sampling, stratified random sampling, cluster sampling, systematic sampling, or convenience sampling. a. All freshmen at a university are enrolled in 1 of 30 sections of a seminar course. To select a sample of freshmen at this university, a researcher selects 4 sections of the seminar course at random from the 30 sections and all students in the 4 selected sections are included in the sample. b. To obtain a sample of students, faculty, and staff at a university, a researcher randomly selects 50 faculty members from a list of faculty, 100 students from a list of students, and 30 staff members from a list of staff. c. A university researcher obtains a sample of students at his university by using the 85 students enrolled in his Psychology 101 class. d. To obtain a sample of the seniors at a particular high school, a researcher writes the name of each senior on a slip of paper, places the slips in a box and mixes them, and then selects 10 slips. The students whose names are on the selected slips of paper are included in the sample. e, To obtain a sample of those attending a basketball game, a researcher selects the 24 th person through the door. Then, every 50 th person after that is also included in the sample.

You have been asked to determine on what types of grasslands two species of birds, northern harriers and short-eared owls, build nests. The types of grasslands to be used include undisturbed native grasses, managed native grasses, undisturbed nonnative grasses, and managed nonnative grasses. You are allowed a plot of land \(500 \mathrm{~m}\) square to study. Explain how you would determine where to plant the four types of grasses. What role would randomization play in this determination? Identify any confounding variables. Would this study be considered an observational study or an experiment? (Based on the article "Response of Northern Harriers and Short-Eared Owls to Grassland Management in Illinois," Journal of Wildlife Management \([1999]: 517-523 .)\)

Does alcohol consumption cause increased cravings for cigarettes? Research at Purdue University suggests this is so (see CNN.com web site article "Researchers Find Link Between Cigarette Cravings and Alcohol," dated June 13,1997 ). In an experiment, 60 heavy smokers and moderate drinkers were divided into two groups. One group drank vodka tonics and the other group drank virgin tonics (tonic water alone), but all subjects were told they were drinking vodka tonics. The researchers then measured the level of nicotine cravings (by monitoring heart rate, skin conductance, etc.). Those who had consumed the vodka tonics had \(35 \%\) more cravings than those who did not. Assuming that the assignment of subjects to the treatment (vodka) and control groups was made at random, do you think there are any confounding factors that would make conclusions based on this experiment questionable?

Explain why blinding is a reasonable strategy in many experiments.

An article in the San Luis Obispo Tribune (September 7,1999 ) described an experiment designed to investigate the effect of creatine supplements on the development of muscle fibers. The article states that the researchers "looked at 19 men, all about 25 years of age and similar in weight, lean body mass, and capacity to lift weights. Ten were given creatine \(-25\) grams a day for the first week. followed by 5 grams a day for the rest of the study. The rest were given a fake preparation. No one was told what he was getting. All the men worked out under the guidance of the same trainer. The response variable measured was gain in fat- free mass (in percent)." a. What extraneous variables are identified in the given statement, and what strategy did the researchers use to deal with them? b. Do you think it was important that the men participating in the experiment were not told whether they were receiving creatine or the placebo? Explain. c. This experiment was not conducted in a double-blind manner. Do you think it would have been a good idea to make this a double-blind experiment? Explain.
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