Having a small bowl of spinach every day is not harmful to health or lead to any side effects. Eating excess spinach every day may slowly start impacting your health in the following ways:
Nutrient deficiency: Spinach contains oxalic acid, a naturally-occurring compound in plants. When the amount of this compound in the body exceeds the normal level it starts affecting the ability of the body to absorb other minerals. Oxalic acid binds with zinc, magnesium, and calcium may lead to a mineral deficiency.
Allergy: The leafy green vegetable contains histamine, a chemical found in some of the body’s cells that may trigger a minor pseudo allergic effect in some cases.
Toxic reaction: Too much spinach intake at one time or over a period of time may have a toxic effect on the body.
Stomach issues: Gas, bloating, and cramps, spinach may also lead to these stomach issues due to high fiber content.