NEW YORK: Fruit is widely recognized as a healthy part of a balanced diet, but making it the centerpiece of nearly every meal can come with serious nutritional trade-offs.
A fruitarian diet, which typically gets most of its calories from raw fruit and may include limited amounts of nuts, seeds and vegetables, can provide plenty of fiber and antioxidants while making it difficult to get enough protein, healthy fats and several essential vitamins and minerals.
Fruitarian diets vary, but most are built around raw fruit and exclude major food groups such as grains. Some followers eat tomatoes, avocados and cucumbers because they consider them fruits botanically, while others follow stricter versions that avoid harvesting altogether and consume only fruit that has naturally fallen from plants.
There is also no universal rule for how much fruit a fruitarian should eat. Some followers eat whenever they are hungry, while others restrict fruit to certain times of the day.
The appeal is understandable. Fruit is naturally rich in vitamins, minerals, antioxidants and dietary fiber, and increasing fruit intake can be beneficial for overall health. But those benefits do not necessarily make a fruit-only diet nutritionally complete.
The nutritional gaps
The biggest concern is what a fruit-heavy diet leaves out.
A diet consisting almost entirely of fruit may provide inadequate amounts of protein, iron, calcium, vitamin D, zinc, vitamin B12 and omega-3 fatty acids. While nuts and seeds can provide some protein and fat, they may not fully compensate for the nutritional gaps created by eliminating other food groups.
Prolonged nutrient deficiencies can contribute to fatigue, weakness, impaired immune function, changes in skin and hair, low mood and weakened bones. In severe cases, inadequate nutrition can lead to more serious complications.
Protein can be difficult to get
Protein is particularly challenging on a strict fruitarian diet.
Adults with minimal physical activity generally need about 0.8 grams of protein per kilogram of body weight each day. People who exercise regularly typically need more, with requirements increasing as physical activity becomes more intense.
Fruit itself is not a major source of protein. Nuts and seeds can help, but people who eat overwhelmingly large amounts of fruit may still struggle to meet their protein needs.
Insufficient protein over time can contribute to muscle loss, weakness, impaired immune function and other health problems.
Fruit still contains sugar
Another consideration is blood sugar.
Fruit contains naturally occurring fructose and other carbohydrates. Because different fruits contain different amounts of carbohydrate and fiber, they can affect blood glucose differently.
Bananas, grapes and some tropical fruits generally have higher glycemic-index values, while apples, oranges and many berries tend to have lower values.
That does not mean people should avoid higher-GI fruits. Whole fruit contains fiber and other nutrients that make it different from foods containing added sugars. But relying on very large quantities of fruit while eliminating other foods can make blood sugar management more difficult for some people.
The issue is especially important for people with diabetes or other conditions affecting blood glucose.
Acid can affect teeth
A fruit-heavy diet may also take a toll on dental health.
Many fruits contain natural acids, with citrus fruits such as lemons, oranges and grapefruits being particularly acidic. Frequent exposure can contribute to dental erosion and weaken tooth enamel over time, particularly when oral hygiene is poor.
Rinsing the mouth with water after eating acidic fruit, brushing twice a day and flossing regularly can help protect teeth.
Why some people choose it
People may adopt a fruitarian diet for several reasons, including weight loss, a desire to eat more whole foods or an interest in reducing their environmental footprint.
The diet can also dramatically increase consumption of fruit, antioxidants and fiber. Many people already fail to consume enough dietary fiber, and fruit can be an easy way to increase intake.
But those benefits can be achieved without eliminating other essential food groups.
A balanced diet can include plenty of fruit while also providing protein, healthy fats, whole grains and other nutrient-dense foods needed for long-term health.
Restrictions can create other problems
The diet’s extreme restrictions can also affect a person’s relationship with food.
Avoiding entire categories of foods can make everyday eating more difficult and, for some people, may contribute to an unhealthy or overly restrictive approach to nutrition.
Certain medical conditions require even greater caution. People with pancreatic or kidney disorders, for example, may have specific dietary requirements and should not adopt a highly restrictive diet without professional guidance.
A balanced approach matters
Fruit can be an important part of a healthy eating pattern, but it is not a complete substitute for a varied diet.
A long-term fruit-only diet can leave the body short of protein and several essential nutrients, while also creating potential challenges for blood sugar and dental health.
Anyone considering a fruitarian diet should talk with a doctor or registered dietitian before making such a significant dietary change. For most people, the nutritional goal is not to eat as much of one food group as possible, but to combine a variety of foods that collectively provide the nutrients the body needs.
