There are several controversial topics related to nutrition using vegetables only. Here are a few examples:
Protein: One of the most commonly debated topics is whether it is possible to obtain enough protein from a plant-based diet. While it is true that many plant-based foods are low in protein, there are plenty of high-protein options such as lentils, tofu, and tempeh. Some argue that it is difficult to consume enough protein on a plant-based diet, while others believe that a balanced plant-based diet can provide all the necessary nutrients.
Vitamin B12: Another hotly debated topic is whether a vegan or vegetarian diet can provide enough vitamin B12. Vitamin B12 is mostly found in animal-based foods, and deficiency can cause serious health problems. While some plant-based foods are fortified with vitamin B12, it is still recommended that vegans and vegetarians take a supplement.
Raw vs. Cooked: There is some controversy around whether it is better to eat raw or cooked vegetables. Some argue that cooking vegetables destroys important nutrients, while others believe that cooking can actually make certain nutrients more bioavailable. Ultimately, both raw and cooked vegetables can be part of a healthy diet.
Soy: Soy is a controversial food in the plant-based community. While some people believe that soy is a healthy and nutritious protein source, others worry about its potential negative effects on hormones and thyroid function. The research on soy is mixed, and some experts believe that moderate soy intake is safe and beneficial for most people.
Carbohydrates: There is some debate about whether a high-carbohydrate diet can be healthy, particularly for those who are insulin-resistant or have diabetes. While some plant-based foods are high in carbohydrates, such as fruits and starchy vegetables, it is possible to follow a low-carbohydrate plant-based diet by focusing on non-starchy vegetables, nuts, seeds, and protein-rich plant foods.
These are just a few examples of the controversial topics related to nutrition using vegetables only. As with any diet, it is important to do your research and consult with a healthcare professional to ensure that you are meeting your nutritional needs.
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