Tired, no energy – Why am I tired and have no energy since eating plant-based?

If you feel tired and lacking in energy, be sure you are eating enough calories. You have eliminated the high calorie foods: meat, dairy and oil so you simply need to eat more, especially beans, lentils, starchy vegetables and whole grains to make up the calories. Also exercise because you need to use energy to make energy. Depression also contributes to lack of energy. But first of all eat more.