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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

Variation in body mass, intake and total energy expenditure for a male with social noise.Characteristics: 38.44 years of age, 99.52 kg initial body mass, 3506.32 kcal initial intake and 3527.51 kcal total energy expenditure.
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pone-0111709-g009: Variation in body mass, intake and total energy expenditure for a male with social noise.Characteristics: 38.44 years of age, 99.52 kg initial body mass, 3506.32 kcal initial intake and 3527.51 kcal total energy expenditure.

Mentions: Case iii: We use a random value for the social energy influence that is selected from a uniform distribution of points in the range of [0,300] kcal/day, a random sign for the social interaction in equations (15) and (16), and we vary uniformly from (0,1), in the first example (figure 3). These parameters produce small variations over time that are more irregular than those in figure 3 (figure 9). The body mass varies, but the variations are more pronounced in intake and total energy expenditure. When the same conditions are used in the second example (figure 4), the same variation patterns occur (figure 10).


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

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

Variation in body mass, intake and total energy expenditure for a male with social noise.Characteristics: 38.44 years of age, 99.52 kg initial body mass, 3506.32 kcal initial intake and 3527.51 kcal total energy expenditure.
© Copyright Policy
Related In: Results  -  Collection

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

pone-0111709-g009: Variation in body mass, intake and total energy expenditure for a male with social noise.Characteristics: 38.44 years of age, 99.52 kg initial body mass, 3506.32 kcal initial intake and 3527.51 kcal total energy expenditure.
Mentions: Case iii: We use a random value for the social energy influence that is selected from a uniform distribution of points in the range of [0,300] kcal/day, a random sign for the social interaction in equations (15) and (16), and we vary uniformly from (0,1), in the first example (figure 3). These parameters produce small variations over time that are more irregular than those in figure 3 (figure 9). The body mass varies, but the variations are more pronounced in intake and total energy expenditure. When the same conditions are used in the second example (figure 4), the same variation patterns occur (figure 10).

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