I mean come on, a diet of 100% tomatoes does not make any sense, right?

The bulk of human calories on a whole food plant based diet comes typically from beans, legumes chickpeas, soy, root vegetables like potatoes and sweet potatoes, starches in general, grains like whole rice, quinoa, etc.

Then another good portion of the calories typically comes from fruit, and another good portion comes from vegetables and salads.

A diet of 100% tomatoes does not make any sense from a nutritional perspective, they are mostly water, but they are a good addition to a balanced whole food plant-based diet.