Firstly, let's define what communicable and non-communicable diseases mean.
Communicable diseases are illnesses that can be spread from person to person or through contact with infected animals or objects. Examples of communicable diseases include the flu, measles, and COVID-19.
On the other hand, non-communicable diseases are illnesses that cannot be spread from person to person. These diseases are often caused by lifestyle factors such as unhealthy diet, lack of physical activity, or smoking. Examples of non-communicable diseases include heart disease, cancer, and diabetes.
Now, to answer your question, it is not accurate to say that all non-communicable diseases are not caused by deficiencies. Some non-communicable diseases can be caused by deficiencies in certain nutrients. For example, a lack of vitamin D can lead to a bone disease called rickets.
However, it is true that all definite diseases (meaning diseases that are clearly defined and diagnosed) are non-communicable diseases. This is because communicable diseases are often caused by infectious agents such as bacteria or viruses, and their symptoms and diagnoses may be less clear-cut.
I hope this explanation helps you! If you have any more questions, feel free to ask.