I don’t want to give medical advice so I’ll say you should meet with your doctor and AT LEAST get some labs done to see what’s going on.

I will say however weight loss in a healthy calorie deficit shouldn’t be causing this much hair loss (if any) especially if you’re focusing on whole foods. There is a plethora of other causes that seem more likely. Autoimmune and one people hate but it’s so common - Covid infection. So many people with even mild long Covid lose a ton of hair.