[Immuno'logical (the scientific updates you would not dare to read anywhere else): Methionine deprivation, summer body and macrophages polarization].

As summer approaches, methionine-restricted diets might appear to be just another "summer body" promise. Yet behind the loss of fat mass observed in mice lies a genuine metabolic reprogramming: methionine deprivation alters glucose utilization, reduces mitochondrial respiration, and promotes a more glycolytic metabolic profile. This energetic shift extends beyond muscle and adipose tissue, directly influencing immune cell behavior. We will explore how such restriction can skew macrophages toward a pro-inflammatory M1 phenotype, and limit the activation and proliferation of Th1 and Th17 lymphocytes, with effects that vary according to the pathological context - metabolic syndrome, cancer, or autoimmune diseases. Through this synthesis, Immuno'logique aims to make findings from fundamental science literature more digestible while highlighting their potential clinical implications. In short, let us be serious without taking ourselves too seriously, and discover how methionine deprivation can reshape metabolism and immunity.