What Causes Metallic Taste And Fatigue While On Nutritarian Diet?

I recently began the nutritarian diet. I ve lost about 8 pounds in 14 days but am experiencing fatigue, excessive sweating, brain fog, and a metallic taste in my mouth. I exercise nearly every day (usually walking 4-6 miles, or elliptical with high resistance for 40 minutes). I was promised that I would feel healthy and energetic when flooding my body with all these nutrients coming from greens, nuts, seeds, onions mushrooms, beans, etc. I have eliminated nearly all dairy products. However, I have had some meat on the diet. My husband is also experiencing fatigue and the metallic taste in his mouth.