Hibernating bears and long-distance migrating birds become insulin resistant during fat storage.
"The hibernating bear and the long-distance migrating bird, they become insulin resistant as well." (said at 0:46:16)
Reversible metabolic adaptations in hibernators and long-distance migratory species are well-documented, but the timing in bears differs from the typical assumption: physiological studies in brown and grizzly bears demonstrate that they remain insulin sensitive during the hyperphagic fat-storage period (spring and autumn) and develop reversible, protective insulin resistance specifically during winter hibernation fasting to preserve glucose for the central nervous system. In migratory birds, extreme pre-migratory fat accumulation and naturally high circulating glucose levels occur without progressing to pathological insulin resistance or diabetes.
- context: Life in the fat lane: seasonal regulation of insulin sensitivity, food intake, and adipose… (Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology 2017) · cited 87x in the literature
"Bears were insulin resistant during hibernation but were sensitive during the spring and fall active periods." (abstract, results, passage verified)
pubmedfull study (doi) - supports: The Brown Bear and Hibernating Mammals as a Translational Model for Human Resilience: Insi… (Biology 2025) · cited 3x in the literature
"Hibernating animals, specifically brown bears ( Ursus arctos ), survive prolonged immobility, starvation, and bradycardia without resultant pathology. This review incorporates adaptations observed in bears and certain torpid species, including reversible insulin resistance" (abstract, results, passage verified)
pubmedfull study (doi) - supports: Comparative physiology and biomimetics in metabolic and environmental health: what can we … (Diabetologia 2026) · cited 2x in the literature
"For example, hibernation can serve as a model for understanding metabolic diseases, providing insights into reversible insulin resistance and energy homeostasis." (abstract, passage verified)
pubmedfull study (doi)
As fruit ripens and becomes overripe, its sugar content increases while its vitamin C content decreases.
"they'll eat fruit, but they'll wait till it ripens. Even more, they like it when it's almost a little mushy. And what happens is, when that happens, the sugar content goes up and the vitamin C content goes down." (said at 0:56:44)
The statement requires qualification. As fruits ripen, complex carbohydrates and starches are typically converted into simple reducing sugars (such as glucose and fructose) and total soluble solids increase, confirming the rise in sugar content. However, the trajectory of vitamin C (ascorbic acid) varies significantly depending on the fruit species and ripening phase: during standard maturation and ripening, vitamin C often increases alongside sugars (such as in tomatoes, bell peppers, and papayas), while in the late senescence or overripe ('mushy') stages, oxidative degradation can lead to a net decline in ascorbic acid in several fruits.
- context: How does tomato quality (sugar, acid, and nutritional quality) vary with ripening stage, t… (Journal of agricultural and food chemistry 2008) · cited 370x in the literature
"During ripening, concentrations in reducing sugars, carotenes, ascorbate, rutin, and caffeic acid derivates increased, whereas those in titratable acidity, chlorophylls, and chlorogenic acid content decreased." (abstract, results, passage verified)
pubmedfull study (doi) - context: Evaluation of microbiome and physico-chemical profiles of fresh fruits of Musa paradisiaca… (PloS one 2024) · cited 8x in the literature
"Accordingly, the lowest pH (3.53) and highest content of ascorbic acid (69.87 mg/100g) were observed in mature green oranges and overripe papaya, respectively, while the maximum concentration of total sugar (17.87%) and reducing sugar (14.20%) were recorded in overripe bananas." (abstract, results, passage verified)
pubmedfull study (doi) - partial: Study of carbohydrate, bioactive compounds, antioxidants, vitamin C, and mineral content a… (Cellular and molecular biology (Noisy-le-Grand, France) 2025)
"In Experiment 2: glucose, sucrose, and vitamin C decreased while fructose, TSS, pH, and biomass increased." (abstract, results, passage verified)
pubmedfull study (doi)
A study conducted in Japan on lean, healthy individuals without diabetes, hypertension, or elevated triglycerides found that high uric acid alone increased the risk for developing obesity, diabetes, hypertension, and chronic kidney disease over the following years.
"we did do this one study where we took people—this was a study in Japan, but we took all these people who were lean, did not have diabetes, did not have high blood pressure, did not have high triglycerides. Basically, they were healthy, and the only thing they had was a high uric acid. And that group, you know, we didn't have to worry about confounding factors. None of them were overweight. And that group showed that they had an increased risk for developing obesity, diabetes, high blood pressure, chronic kidney disease in the next few years compared to people who did not have a high uric acid." (said at 1:10:39)
A 5-year longitudinal cohort study conducted in Tokyo, Japan (Kuwabara et al., 2017) examined 5,899 healthy adults who were lean (not overweight/obese) and free of hypertension, diabetes, dyslipidemia, and chronic kidney disease (CKD) at baseline. Over 5 years, isolated asymptomatic hyperuricemia was associated with a statistically significant increased risk of developing overweight/obesity (8.9% vs. 3.0%), hypertension (14.9% vs. 6.1%), dyslipidemia (23.1% vs. 15.5%), and CKD (19.0% vs. 10.7%). The incidence of diabetes was also higher in the hyperuricemic group (1.7% vs. 0.9%), but this difference was a trend that did not reach statistical significance (P = 0.087).