I switched to a whole food plant based diet after reading "How not to Die", and I believe it's served me well during the pandemic, cooking for myself and hitting my micronutrients pretty much every day. I check using cronometer.com, and in pretty much every category I'm getting more than enough.
Eating the same thing every day isn't the problem; it's not eating enough different things to get all your nutrients. Just for example, I pretty much eat beets, broccoli, blueberries, almonds, bananas, mango, dates, oatmeal, greens, legumes (lentils, chickpeas or kidney beans), turmeric, flax seed and nutritional yeast (for B12)) every day. My labs a week ago were perfect, I'm actually over for vitamins D and B12.
Eating the same thing every day isn't the problem; it's not eating enough different things to get all your nutrients. Just for example, I pretty much eat beets, broccoli, blueberries, almonds, bananas, mango, dates, oatmeal, greens, legumes (lentils, chickpeas or kidney beans), turmeric, flax seed and nutritional yeast (for B12)) every day. My labs a week ago were perfect, I'm actually over for vitamins D and B12.