27 Jan 2021 --- Restricting eating to an eight-hour window when physical activity is highest decreased the risk of development, growth and metastasis of breast cancer in mouse models in a new US study.Researchers at the University of California (UC) San Diego have shown that time-restricted feeding (TRF) – a form of intermittent fasting aligned with circadian rhythms – improved metabolic health and tumor circadian rhythms in mice with obesity-driven postmenopausal breast cancer.