A mother's high-fat diet during pregnancy altered the endocannabinoid system in offspring fat tissue differently in males and females
Rat pups born to mothers on high-fat diets showed early obesity and sex-specific changes in cannabinoid receptor expression across different fat tissue types at weaning.
Quick Facts
What This Study Found
Maternal high-fat diet during pregnancy and nursing produced early obesity in rat pups, with enlarged white fat cells and increased lipid in brown fat tissue. The endocannabinoid system was altered in the offspring's fat tissue, but the pattern differed dramatically by sex.
In male pups, maternal high-fat diet decreased both CB1 and CB2 cannabinoid receptors in subcutaneous fat. In female pups, CB1 increased in visceral fat but decreased in subcutaneous fat. In brown fat tissue (which burns energy rather than storing it), CB1 increased in both sexes.
Estrogen receptor expression was also differentially changed across fat depots in males and females, suggesting interconnected hormonal and endocannabinoid programming.
Key Numbers
Maternal diet: 9% fat (control) vs 29% fat (high-fat). CB1 and CB2 both decreased in male subcutaneous fat. CB1 increased in female visceral fat. CB1 increased in brown fat regardless of sex. Effects measured at weaning.
How They Did This
Female rats received either standard diet (9% fat) or high-fat diet (29% fat) before mating, through pregnancy, and during lactation. Male and female pups were studied at weaning for fat cell size, lipid accumulation, cannabinoid receptor expression (CB1, CB2), metabolizing enzymes, and estrogen receptors across subcutaneous, visceral, and brown fat depots.
Why This Research Matters
This study demonstrates that maternal nutrition can reprogram the endocannabinoid system in offspring before they ever encounter food choices of their own. The sex-specific patterns help explain why obesity risk and fat distribution differ between males and females, and point to the endocannabinoid system as a key mediator of this developmental programming.
The Bigger Picture
The endocannabinoid system is increasingly recognized as a central regulator of energy balance and metabolism. Finding that it can be reprogrammed by maternal diet before birth adds a developmental dimension to our understanding of the obesity epidemic and suggests that metabolic interventions may need to begin much earlier than currently practiced.
What This Study Doesn't Tell Us
Animal study using rats, whose fat biology differs from humans in important ways. The 29% fat diet, while considered high-fat for rats, produces different metabolic effects than human dietary patterns. Only one timepoint (weaning) was examined, so the persistence of these changes is unknown. Sample sizes were not specified in the abstract.
Questions This Raises
- ?Do these endocannabinoid changes persist into adulthood or resolve after weaning?
- ?Would a mother's cannabis use during pregnancy compound these metabolic effects through the same receptor systems?
- ?Could targeting the endocannabinoid system in early life prevent diet-programmed obesity?
Trust & Context
- Key Stat:
- CB1 receptor changes were opposite in male vs female offspring fat tissue
- Evidence Grade:
- Animal study examining developmental programming of the endocannabinoid system. Provides mechanistic insight but findings require human confirmation.
- Study Age:
- Published in 2017. Research on developmental programming of the endocannabinoid system continues to expand.
- Original Title:
- Perinatal maternal high-fat diet induces early obesity and sex-specific alterations of the endocannabinoid system in white and brown adipose tissue of weanling rat offspring.
- Published In:
- The British journal of nutrition, 118(10), 788-803 (2017)
- Authors:
- Almeida, Mariana M, Dias-Rocha, Camilla P, Souza, André S, Muros, Mariana F, Mendonca, Leonardo S, Pazos-Moura, Carmen C, Trevenzoli, Isis H
- Database ID:
- RTHC-01325
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Does this have anything to do with cannabis use during pregnancy?
This study examined how maternal diet (not cannabis) alters the endocannabinoid system in offspring. However, the findings are relevant because they show that cannabinoid receptors in developing fat tissue are sensitive to maternal conditions, raising questions about whether cannabis exposure during pregnancy could compound these effects.
Why did males and females respond differently?
The sex-specific patterns likely relate to differences in hormonal programming, as estrogen receptors were also differentially affected. Males and females develop different body fat distributions partly through endocannabinoid and hormonal signaling, and maternal diet appears to alter this programming from the earliest stages.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-01325APA
Almeida, Mariana M; Dias-Rocha, Camilla P; Souza, André S; Muros, Mariana F; Mendonca, Leonardo S; Pazos-Moura, Carmen C; Trevenzoli, Isis H. (2017). Perinatal maternal high-fat diet induces early obesity and sex-specific alterations of the endocannabinoid system in white and brown adipose tissue of weanling rat offspring.. The British journal of nutrition, 118(10), 788-803. https://doi.org/10.1017/S0007114517002884
MLA
Almeida, Mariana M, et al. "Perinatal maternal high-fat diet induces early obesity and sex-specific alterations of the endocannabinoid system in white and brown adipose tissue of weanling rat offspring.." The British journal of nutrition, 2017. https://doi.org/10.1017/S0007114517002884
RethinkTHC
RethinkTHC Research Database. "Perinatal maternal high-fat diet induces early obesity and s..." RTHC-01325. Retrieved from https://rethinkthc.com/research/almeida-2017-perinatal-maternal-highfat-diet
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.