Towards Understanding Between ADT Treatment, Circadian Rhythm, and Physiological Responsiveness

Frailty affects more than 5.4 million people over the age of 65 in the United States (\>10%) and is one of the main reasons older adults lose independence. Frailty describes a reduced ability to withstand stress on the physiological scale, or a reduced physiological reserve. It is characterized by five key signs and symptoms, known as Fried's frailty criteria: weakness, slow walking speed, low physical activity, fatigue or exhaustion, and unintentional weight loss. Frailty does not progress linearly; its pathogenesis often accelerates in response to a "stressor event" such as an illness (e.g., coronavirus), the death of a spouse, or cancer treatment. For example, a diagnosis with prostate cancer and androgen deprivation therapy (ADT) treatment are associated with accelerated frailty. While the body is resilient to everyday stressors, these large-scale, enduring stressors can accumulate and cause the body to have difficulty predicting energy supply and demand. The result is that stress-induced energy costs compete with cellular growth, maintenance, and repair, i.e., frailty. Treatments for frailty are intensive (e.g., weight training) and often unsuccessful, and there is a critical need to develop effective interventions to complement and replace these interventions to prevent and treat frailty. The theory is that entrainment of circadian rhythm, or the body's internal body clock, will improve the body's ability to predict energy supply and demand, and therefore enable the body to allocate more resources to anabolic processes and promote resilience to cancer treatment, thereby preventing the progression of frailty. Time-restricted eating (TRE) entails consuming food within a defined, consistent window every day. It has emerged as a powerful intervention to entrain circadian rhythm and regulate metabolic homeostasis. The hypothesis is that, by entraining circadian rhythm, TRE can enhance physiological regulation and prevent stressor-induced frailty. A total of 30 patients over 55 years old undergoing ADT therapy for prostate cancer will be recruited. Participants will be randomized 1:1 to a 12-week TRE intervention or a time- and attention nutrition control; both groups will be under the supervision of a licensed clinical nutritionist with expertise in the cancer population to ensure adequate macronutrient intake. At baseline and post-intervention, a novel set of five physiological responsiveness measures and frailty using Fried's Frailty Index will be assessed. These data will allow assessment of Aim 1) the feasibility of TRE among patients with prostate cancer during ADT treatment with the ultimate goal of optimizing an intervention to prevent the progression of frailty and Aim 2) the effects of TRE on: a) Fried's Frailty Index, b) lying-to-standing blood pressure, c) heart rate variability, d) oral glucose tolerance, e) 24-hour circadian cortisol rhythm, and f) usual vs. fast gait speed. This project is innovative and clinically important because once frailty is diagnosed, it is difficult to treat. This project tests a novel theoretical framework that a low cost, widely accessible dietary intervention-TRE-can entrain circadian rhythm and improve physiological reserve in the context of ADT treatment for prostate cancer, thereby preventing progression to frailty.