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Modeling body mass variation: incorporating social influence into calculations of caloric intake and energy expenditure.

Hernández-Hernández AM, Huerta-Quintanilla R - PLoS ONE (2014)

Bottom Line: We observe that social interactions have a considerable effect when the body mass of an individual is quite constant and social interactions take random values.However, when an individual's mass value changes (either increases or decreases), social interactions do not have a notable effect.In our simulation, we tested two different models that describe the body mass composition, and it resulted that one fits better the data.

View Article: PubMed Central - PubMed

Affiliation: Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Mérida, Yucatán, México.

ABSTRACT
Variations in individual body mass and composition have long been a key focus in the health sciences, particularly now that overweight and obesity are considered as public health problems. We study a mathematical model that describes body mass variations which are determined by the energy balance between caloric intake and total energy expenditure. To calculate the change in caloric intake and energy expenditure over time, we proposed a relationship for each of these quantities, and we used measured values that are reported in the literature for the initial conditions. To account for small variations in the daily energy balance of an individual, we include social interactions as the multiplication of two terms: social proximity and social influence. We observe that social interactions have a considerable effect when the body mass of an individual is quite constant and social interactions take random values. However, when an individual's mass value changes (either increases or decreases), social interactions do not have a notable effect. In our simulation, we tested two different models that describe the body mass composition, and it resulted that one fits better the data.

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Body mass in a female individual for whom  is variable and  = 50 Kcal/day.
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pone-0111709-g008: Body mass in a female individual for whom is variable and  = 50 Kcal/day.

Mentions: Comparing (i) and (ii) using the second example (figure 4), reveals that varying (in this case, we use a negative sign) generates a greater variation in body mass than does increasing (figures 7 and 8). Although the individual's tendency is to gain weight slightly, the social interaction leads to a negative variation in body mass. In other words, if a person who wants to gain weight interacts with others who want to lose weight, it will be much more difficult for the former individual to attain her goal. In general, we noticed that gaining (or losing) and maintaining weight will become even more challenging in the case of strong social interactions. [25]


Modeling body mass variation: incorporating social influence into calculations of caloric intake and energy expenditure.

Hernández-Hernández AM, Huerta-Quintanilla R - PLoS ONE (2014)

Body mass in a female individual for whom  is variable and  = 50 Kcal/day.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4219765&req=5

pone-0111709-g008: Body mass in a female individual for whom is variable and  = 50 Kcal/day.
Mentions: Comparing (i) and (ii) using the second example (figure 4), reveals that varying (in this case, we use a negative sign) generates a greater variation in body mass than does increasing (figures 7 and 8). Although the individual's tendency is to gain weight slightly, the social interaction leads to a negative variation in body mass. In other words, if a person who wants to gain weight interacts with others who want to lose weight, it will be much more difficult for the former individual to attain her goal. In general, we noticed that gaining (or losing) and maintaining weight will become even more challenging in the case of strong social interactions. [25]

Bottom Line: We observe that social interactions have a considerable effect when the body mass of an individual is quite constant and social interactions take random values.However, when an individual's mass value changes (either increases or decreases), social interactions do not have a notable effect.In our simulation, we tested two different models that describe the body mass composition, and it resulted that one fits better the data.

View Article: PubMed Central - PubMed

Affiliation: Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Mérida, Yucatán, México.

ABSTRACT
Variations in individual body mass and composition have long been a key focus in the health sciences, particularly now that overweight and obesity are considered as public health problems. We study a mathematical model that describes body mass variations which are determined by the energy balance between caloric intake and total energy expenditure. To calculate the change in caloric intake and energy expenditure over time, we proposed a relationship for each of these quantities, and we used measured values that are reported in the literature for the initial conditions. To account for small variations in the daily energy balance of an individual, we include social interactions as the multiplication of two terms: social proximity and social influence. We observe that social interactions have a considerable effect when the body mass of an individual is quite constant and social interactions take random values. However, when an individual's mass value changes (either increases or decreases), social interactions do not have a notable effect. In our simulation, we tested two different models that describe the body mass composition, and it resulted that one fits better the data.

Show MeSH
Related in: MedlinePlus