An interesting extension of this research is to explore how dietary macronutrient proportions influence the fitness and population demographics of brown bear. Macronutrient proportions have physiological effects on individual body composition, with high‐protein diets generally resulting in animals with lower body fat and greater lean mass than animals on high‐carbohydrate or ‐lipid diets and vice versa (Solon‐Biet et al., 2014). This pattern can be observed among brown bears, which gain primarily lean mass in spring and fat mass in autumn. Examining other effects of macronutrient proportions on bear populations may be revealing. Low‐protein, high‐carbohydrate diets have been associated with increased longevity and health span across several model organisms; conversely, high‐protein, low‐carbohydrate diets have been associated with reduced lifespan, but increased reproductive parameters (Raubenheimer, Simpson, Le Couteur, Solon‐Biet, & Coogan, 2016).