Eat the skin and fatty parts of meat when you know where it comes from, and lean cuts when you're not sure of the quality.
Winter is the most dangerous time of year due to vitamin D deficiency and circadian misalignment. It is the most important time to take supplements and ensure your parents and grandparents do too. Find the list of «must-haves» here: https://blooness.com/meilleurs-supplements-stimuler-systeme-immunitaire/