A modified standard American diet induces physiological parameters associated with metabolic syndrome in C57BL/6J mice.

Investigations into the causative role that western dietary patterns have on obesity and disease pathogenesis have speculated that quality and quantity of dietary fats and/or carbohydrates have a predictive role in the development of these disorders. Standard reference diets such as the AIN-93 rodent diet have historically been used to promote animal health and reduce variation of results across experiments, rather than model modern human dietary habits or nutrition-related pathologies. In rodents high-fat diets (HFDs) became a classic tool to investigate diet-induced obesity (DIO). These murine diets often relied on a single fat source with the most DIO consistent HFDs containing levels of fat up to 45-60% (kcal), higher than the reported human intake of 33-35% (kcal). More recently, researchers are formulating experimental animal (pre-clinical) diets that reflect mean human macro- and micronutrient consumption levels described by the National Health and Nutrition Examination Survey (NHANES). These diets attempt to integrate relevant ingredient sources and levels of nutrients; however, they most often fail to include high-fructose corn syrup (HFCS) as a source of dietary carbohydrate. We have formulated a modified Standard American Diet (mSAD) that incorporates relevant levels and sources of nutrient classes, including dietary HFCS, to assess the basal physiologies associated with mSAD consumption. Mice proffered the mSAD for 15 weeks displayed a phenotype consistent with metabolic syndrome, exhibiting increased adiposity, fasting hyperglycemia with impaired glucose and insulin tolerance. Metabolic alterations were evidenced at the tissue level as crown-like structures (CLS) in adipose tissue and fatty acid deposition in the liver, and targeted 16S rRNA metagenomics revealed microbial compositional shifts between dietary groups. This study suggests diet quality significantly affects metabolic homeostasis, emphasizing the importance of developing relevant pre-clinical diets to investigate chronic diseases highly impacted by western dietary consumption patterns.

High Fructose Corn Syrup-Moderate Fat Diet Potentiates Anxio-Depressive Behavior and Alters Ventral Striatal Neuronal Signaling.

The neurobiological mechanisms that mediate psychiatric comorbidities associated with metabolic disorders such as obesity, metabolic syndrome and diabetes remain obscure. High fructose corn syrup (HFCS) is widely used in beverages and is often included in food products with moderate or high fat content that have been linked to many serious health issues including diabetes and obesity. However, the impact of such foods on the brain has not been fully characterized. Here, we evaluated the effects of long-term consumption of a HFCS-Moderate Fat diet (HFCS-MFD) on behavior, neuronal signal transduction, gut microbiota, and serum metabolomic profile in mice to better understand how its consumption and resulting obesity and metabolic alterations relate to behavioral dysfunction. Mice fed HFCS-MFD for 16 weeks displayed enhanced anxiogenesis, increased behavioral despair, and impaired social interactions. Furthermore, the HFCS-MFD induced gut microbiota dysbiosis and lowered serum levels of serotonin and its tryptophan-based precursors. Importantly, the HFCS-MFD altered neuronal signaling in the ventral striatum including reduced inhibitory phosphorylation of glycogen synthase kinase 3ß (GSK3ß), increased expression of ΔFosB, increased Cdk5-dependent phosphorylation of DARPP-32, and reduced PKA-dependent phosphorylation of the GluR1 subunit of the AMPA receptor. These findings suggest that HFCS-MFD-induced changes in the gut microbiota and neuroactive metabolites may contribute to maladaptive alterations in ventral striatal function that underlie neurobehavioral impairment. While future studies are essential to further evaluate the interplay between these factors in obesity and metabolic syndrome-associated behavioral comorbidities, these data underscore the important role of peripheral-CNS interactions in diet-induced behavioral and brain function. This study also highlights the clinical need to address neurobehavioral comorbidities associated with obesity and metabolic syndrome.

Identifying sustainable lifestyle strategies for maintaining good glycemic control: a validation of qualitative findings.

INTRODUCTION: Diabetes self-care practices are less effective outside of controlled research settings, and almost half of patients do not achieve good glycemic control. Qualitative studies suggest some lifestyle strategies may be linked to good control, but those strategies have not been validated. This study provides population-based evidence that dietary strategies identified in qualitative studies are associated with glycemic control in US patients with diabetes. RESEARCH DESIGN AND METHODS: In a cross-sectional sample of the National Health and Nutrition Examination Survey (NHANES), qualitative self-management themes were matched to survey questions and used to predict good glycemic control (hemoglobin A1c <7.0% (53 mmol/mol)). Patients were limited to those 50 years of age and older with a diagnosis of diabetes for at least 1 year (N=465). RESULTS: Patients averaged 65 years of age with a body mass index of 32.56 kg/m2 and 42% reported no physical activity. In logistic regression models controlling for sociodemographic and medical history variables, self-monitoring of blood glucose, weight loss, and physical activity were not significantly associated with glycemic control. Instead, dietary practices such as consuming low-calorie foods (OR=4.05, 95% CI 1.64 to 10.01), eating less fat (OR=2.15, 95% CI 1.03 to 4.47), and reducing sodium (OR=1.94, 95% CI 1.18 to 3.17) were significantly associated with good glycemic control, as was diabetes education or consultation with a dietitian (OR=3.48, 95% CI 1.28 to 9.45). Non-adherence to medications (OR=0.27, 95% CI 0.11 to 0.68) and general dietary descriptions, such as following a 'diabetic diet' (OR=0.32, 95% CI 0.17 to 0.57) and 'changing eating habits for weight loss' (OR=0.34, 95% CI 0.15 to 0.77), were associated with poorer glycemic control. CONCLUSIONS: The NHANES validation of lifestyle management strategies suggests practices that may be sustainable. In a population that tends to be obese with low physical activity, successful self-care might emphasize specific dietary practices offering concrete touchpoints for patient communication and guidance. These strategies might help maintain glycemic control.

Patient Impressions of Possible Catastrophic Outcomes after Diabetic Foot Ulceration.

BACKGROUND: Diabetes Mellitus (DM) and its complications are well studied; patients with diabetes may suffer from neuropathy and vascular issues, and associated with these, lower extremity ulceration. Ulcers are often refractory to treatment, and can be difficult for both patients and clinicians to manage. Such complications may lead to amputations, which in turn are a risk factor for death. However, in certain situations amputation may be the only option available, and may be used as reconstructive surgery, restoring function. The impacts of ulceration, amputation, use of prostheses, and other complications of diabetes on Quality of Life (QOL) are well studied. Similarly, the impact of QOL on overall health has been studied in some detail. OBJECTIVE: Not as well understood are patient expectations regarding amputation and ulceration, and patient knowledge of these outcomes. Specifically, it is not fully understood how patients view these complications prior to their occurrence. In this review we survey the literature for studies discussing these attitudes. Our objective was to perform a systematic review of the medical literature to understand how patients understand and anticipate the potential negative outcomes of ulceration and amputation. We also aimed to identify areas where there are gaps in patient knowledge, which could be addressed by clinicians. RESULTS: Our study yielded articles regarding impressions of patients with diabetes about their general health and outcomes. However, we did not discover much literature directly concerning attitudes toward catastrophic lower extremity outcomes before they occurred. We also identified that patients lack knowledge of management and complications of diabetes; both of these gaps provide an opportunity to better direct care for such patients.

Effects of Comorbid Depression and Diabetes Mellitus on Cognitive Decline in Older Mexican Americans.

OBJECTIVES: To assess the relationship between comorbid depression, diabetes mellitus (DM), and cognitive decline in Mexican Americans aged 65 and older. DESIGN: Retrospective cohort study with longitudinal analysis. SETTING: Texas, New Mexico, Colorado, Arizona, and California. PARTICIPANTS: Hispanic Established Populations for the Epidemiologic Study of the Elderly. MEASUREMENTS: Cognition was assessed using the Mini-Mental State Examination (MMSE). Depression was defined as a score of 16 or greater on the Center for Epidemiologic Studies Depression Scale. DM was defined as according to self-reported history or taking insulin or oral hypoglycemic medication. RESULTS: Participants with depression and DM declined an average of 6.5 points on the MMSE; depression only, 4.4 points; DM only, 7.8 points; and neither condition, 4.2 points across the six examination waves. Participants with DM declined an average of 0.18 more points on the MMSE per year (P=.001) than those with neither DM nor depression, and those with comorbid DM and depression declined 0.25 more points per year (P=.002). Depression was associated with significantly greater cognitive decline (ß^=-0.11, P=.05) after excluding participants with baseline cognitive impairment (MMSE score≤17). Participants with DM were 1.08 (95% CI=1.03-1.12) times as likely as those with neither DM nor depression, and those with comorbid DM and depression were 1.08 (95% CI=1.01-1.15) times as likely as those with neither DM nor depression to develop severe cognitive impairment per year. CONCLUSION: DM and comorbid depression and DM are risk factors for cognitive decline in older Mexican Americans. Interventions that reduce the prevalence of depression and DM in Mexican Americans may decrease the number of older adults who experience cognitive decline.