What did our ancestors eat?

I think for the majority of human history our ancestors were hunters and gatherers.  I think, they were likely more gatherers them hunters.  I think plant-based food were easier to “catch”.  I also think the plant based food were low in calories and consumed soon after gathering to avoid need for storage.  I know there were no Quaker Oats or Tim Hortons back then; but they would most likely be able to count on starting the day with a Dark Green Leafy diet to get them recharged and ready for hunting.
“Always including vegetables in meals.....A healthy diet includes at least 400 grams of vegetables and 2 servings of fruit per day, excluding potatoes, sweet potatoes, cassava and other starchy roots.”  For more details please refer to World Health Organization Nutrition Fact Sheet.