Hi Daniel, from your info I believe I am the one lack of yin as I am always feel cold-hand and feet. always feel tired too. therefore am I lack of yin? so would you please advise me as what should I take or eat as normal days. I am still not sure how to improve my yin level. Please advise and thanks so much your help. You are great as a chinese Dr and trainer. Will continue watch your youtubes more in the future. thanks again...Ivan