I have been on a keto diet and intermittent fasting for 3 months. I have lost 60 pounds but my white blood cell count dropped from about a steady 6.9 to 3.4 (which is below normal). I have had a blood test done every 3 months for about 2 years and this is the first time my white blood cells dropped to below normal. I'm wondering if this is a normal adaptation to the diet (maybe from reduced inflammation) or a nutritional deficiency, or what?

I take vitamin C, vitamin D3, omega 3, and zinc, 3 times per week. Everyday I drink a blended green drink (about 80 grams total of: celery, cucumber, spinach and a pinch of collagen powder) at 2pm and 100 grams of protein with some fat or oil at 9pm.
Everyday I work out for 30 mins (medium intensity) at 3pm and sleep from 11pm to 10 am. I'm 6'1 and currently weigh 200 pounds.

I appreciate any comment or feedback. Thanks!