Clinical Nutrition and Dietetics — NCERT Solutions

The studies show that diet can influence disease causation and disease prevention.

(a) Role of diet in disease causation:
Unhealthy food habits can contribute to disease. The chapter states that increased intake of fat, sugar, salt, and refined foods, along with low fibre and less physical activity, are associated with diseases such as obesity, diabetes, cardiovascular disease, hypertension and colon cancer.

(b) Role of diet in disease prevention:
A healthy diet can help prevent disease. Foods such as fish (rich in omega-3 fatty acids), fruits, vegetables, whole grains, legumes, low-fat dairy products, and lean meats are linked with better health and lower risk of heart disease. Thus, a balanced diet helps in prevention of chronic diseases and promotes good health.

The study of clinical nutrition and dietetics is significant because it deals with nutrition during illness and the nutritional management of patients with disease. It helps in:

• providing optimum nutrition for immunity, healing and recovery,
• supporting medical treatment in disease conditions,
• improving prognosis, recovery and duration of hospitalisation,
• preventing and managing acute and chronic diseases, and
• ensuring that patients receive individualised diet therapy through a trained dietitian/clinical nutritionist.

It also has growing importance because more people now need nutritional care due to communicable diseases, non-communicable diseases, ageing, and emerging health problems.

A medical nutrition therapist may make the following types of dietary modifications:

1. Change in consistency and/or texture — for example, liquid, soft, or mechanically soft diets.
2. Change in energy intake — increase or decrease calories.
3. Change in nutrient composition — for example:

• higher or lower protein,
• lower fat,
• restricted sodium,
• restricted fluid,
• high or low fibre.

4. Restriction of certain foods if they contain unwanted substances, such as foods rich in oxalates.
5. Change in number of meals or intervals of feeding.
6. Change in route of feeding when needed, such as tube feeding or intravenous feeding.

These modifications are made according to the patient’s disease condition and nutritional needs.

We need dietary changes to prevent chronic diseases because the chapter explains that modern diets often contain more fat, sugar, salt and processed foods and less fibre, vitamins and minerals. Such dietary patterns are linked with a higher risk of obesity, diabetes, cardiovascular disease, hypertension and colon cancer.

These diet changes are closely linked with lifestyle because chronic disease risk also rises with less physical activity, stress, and dependence on convenience/processed foods. Therefore, healthy food choices along with an active lifestyle help prevent chronic diseases and delay their onset.