Quite a while back I met up with a new friend for lunch. Being at a healthy cafe turned the conversation toward health, and my friend mentioned that she was worried about her partner’s health as he was always congested. She was thinking it might be linked to dairy but said he would never give it up. I told her that I avoid mostly dairy because it always makes me congested and gives me brain fog. And the conversation moved on. When I saw her a few weeks later, she excitedly grabbed my arm. “Oh, I must tell you. After …