What Happens if You Eat Only Fruits and Vegetables for Two Weeks?
Jan 3, 2025 • 6 min read
Published on January 3, 2025 | Updated on July 31, 2025
January 3, 2025
MS, Registered Dietitian, Former President of CT Academy of Nutrition & Dietetics
Could eating only fruits and vegetables for two weeks improve your health—or leave your body struggling? While fruits and vegetables are packed with nutrients, they can’t provide everything your body needs.
Let’s explore the potential benefits, risks, and smarter ways to incorporate more plant-based eating into your life. Keep your daily nutrients in check with Omo, a healthy weight-loss app that focuses on nutrition and building sustainable healthy habits.
Fruits and vegetables are nature’s multivitamins, offering a wealth of nutrients that fuel your body, protect against disease, and support overall well-being. Packed with essential vitamins, minerals, antioxidants, and fiber, they play a pivotal role in maintaining optimal health.
Here are some key nutritional benefits of a diet rich in fruits and vegetables:
Fruits like oranges, strawberries, and kiwis are loaded with vitamin C, which boosts immune function and promotes collagen production for healthy skin.
Vegetables such as spinach and kale provide vitamin A, vital for good vision, immune defense, and cell growth.
Leafy greens and cruciferous vegetables (e.g., broccoli) are excellent sources of vitamin K, which support bone health and proper blood clotting.
Fiber is critical for digestive health, helping regulate bowel movements, lower cholesterol levels, and maintain stable blood sugar.
Soluble fiber in foods like apples and carrots slows digestion, helping you feel full longer, while insoluble fiber in leafy greens promotes regularity.
Fruits and vegetables are loaded with antioxidants like flavonoids, carotenoids, and polyphenols. These compounds neutralize harmful free radicals, reducing inflammation and lowering the risk of chronic conditions like heart disease and diabetes.
Unique plant compounds in fruits and veggies, known as phytochemicals, offer protective benefits against various diseases. For example:
Sulforaphane in broccoli activates detoxifying enzymes that reduce cancer risk.
Quercetin in apples and onions exhibits anti-inflammatory properties that support heart health.
Studies show that diets rich in fruits and vegetables can lower the risk of cardiovascular disease by up to 30%. This benefit is linked to their high potassium, fiber, and antioxidant content, which work together to manage blood pressure, reduce cholesterol, and prevent arterial damage.
Fruits and vegetables improve gut health by acting as natural prebiotics, feeding the beneficial bacteria in your gut. A healthy microbiome supports digestion, enhances nutrient absorption, and strengthens immunity.
The combination of antioxidants, fiber, and phytochemicals in fruits and vegetables has been shown to reduce the risk of certain cancers, including colorectal, lung, and stomach cancers. A high intake of cruciferous vegetables, like broccoli and Brussels sprouts, has been particularly linked to reduced cancer risk.
The idea of eating only fruits and vegetables can seem highly appealing, given their numerous health benefits and their low-calorie, high-volume qualities that can support weight management.
Despite their many benefits, fruits and vegetables alone cannot provide all the essential nutrients your body needs. While a short-term diet of this kind may be harmless, extending it to weeks can lead to potential health risks.
Fruits and vegetables are naturally low in calories. A diet exclusively composed of these foods may fall below the recommended daily intake:
Women: 1,200–1,500 calories minimum.
Men: 1,500–1,800 calories minimum.
For example, a cup of steamed carrots and broccoli contains only 40-80 calories, two cups of a vegetable stir-fry with no oil is only about 150 calories, and a 12-ounce portion of a fruit smoothie contains approximately 75 calories, depending on the ingredients used.
Extreme calorie deficits can slow metabolism, cause fatigue, and make long-term weight loss harder. You may also experience dizziness, fainting, or emotional instability.
Switching abruptly to a high-fiber diet filled with fruits and veggies can lead to bloating, gas, and stomach cramps. Excessive fiber may also hinder nutrient absorption, including key minerals like calcium and iron.
To prevent this, it’s best to gradually increase fiber intake over a few weeks and drink plenty of water to ease digestion.
Some individuals may also experience diarrhea as a result of a fruit-and-vegetable diet as it lacks other foods such as rice, bread, or lean protein which help bind the stool.
Fruits and vegetables, while nutrient-dense, lack certain critical macronutrients and micronutrients (essential nutrients we need in large and small amounts, respectively). Key deficiencies from a two-week diet may include:
Protein deficiency can lead to muscle loss, delayed healing, and fatigue.
Omega-3 & Omega-6 fatty acid deficiency can lead to hormonal imbalances, dry skin, and inflammation.
Iron deficiency. If your iron levels are normal, a two-week diet without iron-rich foods is unlikely to cause a severe deficiency. However, if your levels are already low, such a restriction could significantly worsen the deficiency and lead to fatigue and anemia.
Calcium deficiency can lead to brittle bones and muscle cramps.
Vitamin B12 deficiency which is associated with neurological issues and anemia.
For long-term health and well-being, a well-balanced plant-based diet offers a more sustainable approach than an extreme fruits-and-vegetables-only regimen.
A thoughtfully planned diet can provide all the essential nutrients your body needs while supporting your goals, whether they involve weight management, improved energy levels, or overall wellness.
A balanced diet includes the right proportions of macronutrients (protein, carbohydrates, and fats) and micronutrients (vitamins and minerals). The goal is to ensure your body gets enough energy and nutrients to function optimally.
Key principles include:
Fruits and Vegetables: These should make up about half of your plate. Aim for a variety of colors to ensure a diverse range of vitamins, minerals, and antioxidants.
Whole Grains: Choose whole grains like quinoa, brown rice, oats, and whole-grain bread for sustained energy and fiber.
Protein Sources: Incorporate plant-based proteins such as legumes, tofu, tempeh, lentils, and beans. If you include animal products, lean meats, fish, eggs, and low-fat dairy are excellent choices.
Healthy Fats: Focus on unsaturated fats from avocados, nuts, seeds, and olive oil. Avoid trans fats in packaged, processed foods and limit saturated fats from red meat and full-fat dairy products.
Hydration: Drink plenty of water and limit sugary beverages. Herbal teas and infused water are good alternatives.
This approach recommends filling half your plate with fruits and vegetables, one-quarter with protein sources such as meat, fish, or beans, and the remainder with whole grains like quinoa, sweet potatoes, or brown rice.
Use this visual template to build each meal of your day. If you also aim to lose weight, ensure the size of your plate is about 24 cm or 9.5 inches in diameter.
Some nutrients, such as vitamin B12, may require supplementation on a strictly plant-based diet as this vitamin is found primarily in animal sources. Others, like vitamin D or omega-3s, may also be needed depending on your lifestyle and dietary choices.
A fruit-and-vegetable-only diet might seem like a quick fix for weight loss or health, but it’s too restrictive to sustain long-term. While a two-week stint likely won’t cause severe deficiencies, your body will miss out on crucial nutrients like protein, healthy fats, and key vitamins.
Instead, aim for balance. Fruits and vegetables should remain a central part of your diet, but only when complemented with other nutrient-dense foods for optimal health.
This article is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional advice or help and should not be relied on to make decisions of any kind. Any action you take upon the information presented in this article is strictly at your own risk and responsibility!