Evidence in female rhesus monkeys (Macaca mulatto) that nighttime caloric intake is not associated with weight gain

Elinor Sullivan, Alejandro J. Daniels, Frank H. Koegler, Judy L. Cameron

    Research output: Contribution to journalArticle

    22 Citations (Scopus)

    Abstract

    Objective: To evaluate the hypothesis that nighttime consumption of calories leads to an increased propensity to gain weight. Research Methods and Procedures: Sixteen female rhesus monkeys (Macaca mulatta) were ovariectomized and placed on a high-fat diet to promote weight gain, and we examined whether monkeys that ate a high percentage of calories at night were more likely to gain weight than monkeys that ate the majority of calories during the day. Results: Within 6 weeks post-ovariectomy, calorie intake and body weight increased significantly (129 ± 14%, p = 0.04; 103 ± 0.91%. p = 0.02, respectively). Subsequent placement on high-fat diet led to further significant increases in calorie intake and body weight (368 ± 56%, p = 0.001; 113 ± 4.0%, p = 0.03, respectively). However, there was no correlation between the increase in calorie intake and weight gain (p = 0.34). Considerable individual variation existed in the percentage of calories consumed at night (6% to 64% total daily caloric intake). However, the percentage of calorie intake occurring at night was not correlated with body weight (r = 0.04; p = 0.87) or weight gain (r = 0.07; p = 0.79) over the course of the study. Additionally, monkeys that showed the greatest nighttime calorie intake did not gain more weight (p = 0.94) than monkeys that showed the least nighttime calorie intake. Discussion: These results show that eating at night is not associated with an increased propensity to gain weight, suggesting that individuals trying to lose weight should not rely on decreasing evening calorie intake as a primary strategy for promoting weight loss.

    Original languageEnglish (US)
    Pages (from-to)2072-2080
    Number of pages9
    JournalObesity Research
    Volume13
    Issue number12
    StatePublished - 2005

    Fingerprint

    Macaca
    Macaca mulatta
    Energy Intake
    Weight Gain
    energy intake
    weight gain
    Haplorhini
    monkeys
    Body Weight
    High Fat Diet
    high fat diet
    body weight
    Ovariectomy
    ovariectomy
    research methods
    Weight Loss
    Eating
    weight loss
    Weights and Measures
    ingestion

    Keywords

    • Body fat
    • Estrogen
    • High-fat diet
    • Monkey
    • Ovariectomy

    ASJC Scopus subject areas

    • Medicine (miscellaneous)
    • Public Health, Environmental and Occupational Health
    • Endocrinology
    • Food Science
    • Endocrinology, Diabetes and Metabolism

    Cite this

    Evidence in female rhesus monkeys (Macaca mulatto) that nighttime caloric intake is not associated with weight gain. / Sullivan, Elinor; Daniels, Alejandro J.; Koegler, Frank H.; Cameron, Judy L.

    In: Obesity Research, Vol. 13, No. 12, 2005, p. 2072-2080.

    Research output: Contribution to journalArticle

    Sullivan, Elinor ; Daniels, Alejandro J. ; Koegler, Frank H. ; Cameron, Judy L. / Evidence in female rhesus monkeys (Macaca mulatto) that nighttime caloric intake is not associated with weight gain. In: Obesity Research. 2005 ; Vol. 13, No. 12. pp. 2072-2080.
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