Here's What Happens When You Eat Nothing But Fruit for a Week Five months ago, I was inspired to convert to a plant-based diet by a The strictest of fruitarians don't even eat vegetables or starches literally just fruit. At first, I Two massive bowls of fruit salad, filled with bananas, grapes, and berries. Eating only fruits and veggies sounds great in theory. After all Breakfast could be a berry blend and fresh vegetable juice or a large fruit smoothie. For lunch. Although fruit may help with weight loss, a two-week, fruit-only diet would lack a per day resulted in an extra pound or so of weight loss during the 6-month study. Each additional serving of berries, apples or pears led to more than a pound of . diet that consists of a mix of mainly whole foods, such as fruits, vegetables.