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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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Related in: MedlinePlus

Body mass in a male individual for whom  is variable and  = 50 Kcal/day.
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pone-0111709-g006: Body mass in a male individual for whom is variable and  = 50 Kcal/day.

Mentions: Case ii: In this case, a fixed value for social influence () is used and is varied from 0 to 1. For example, in figure 3, a positive value is used for the social influence ( = +50 kcal/day; figure 6). The social proximity is correlated with the interaction nearness; that is, larger values of (i.e., values closer to 1) correspond to a stronger relationship between this individual and the other individuals with whom s/he interacts. This nearness can be physical or social, but we do not differentiate between the types of nearness in these cases.


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 male 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-g006: Body mass in a male individual for whom is variable and  = 50 Kcal/day.
Mentions: Case ii: In this case, a fixed value for social influence () is used and is varied from 0 to 1. For example, in figure 3, a positive value is used for the social influence ( = +50 kcal/day; figure 6). The social proximity is correlated with the interaction nearness; that is, larger values of (i.e., values closer to 1) correspond to a stronger relationship between this individual and the other individuals with whom s/he interacts. This nearness can be physical or social, but we do not differentiate between the types of nearness in these cases.

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