It's always best to follow a varied diet.
Eating a small amount of beetroot every day is unlikely to do any harm, but a high intake could lead to low blood pressure, red or black urine and feces, and digestive problems for anyone with a sensitivity to the nutrients. A high daily beet consumption may also mean you are not getting nutrients from other foods, however, so try to vary your diet.
Always speak with a doctor before making significant dietary changes.