Potassium is the most important nutrient your body needs. It’s high in salmon, other oily fish, leafy green vegetables, avocados, bananas, nuts, grains, etc. When you have normal levels you feel energy, vitality, muscle strength. When you have low levels you feel brain fog, fatigue, muscle weakness/aches/nerve pain. Under stress, especially high stress, your potassium levels drop drastically and your body feels it in these symptoms, the same for depression or anxiety. I think most people are in a semi-sick state to a great extent from low potassium, but also low magnesium and dehydration. Now I’m getting all my mineral and vitamin needs on keto by blending a big pitcher every morning for smoothies: cocoa powder, stevia, three avocados, 4 cups raw kale, 1 cup blackberries 1/3 cup Greek yogurt, 2 tablespoons flax seed meal. Drink half with breakfast and the other half in the afternoon. Also drinking a gallon of water daily.