Water safety and purification methods

Small, frequent meals may be useful when a patient has poor appetite, weakness, nausea, early fullness, or difficulty eating a large portion at once. Dividing food into manageable servings can improve tolerance and help increase total nutrient intake. The exact schedule should be adapted to the illness, medication timing, and advice of the healthcare team.

Safe water is important for maintaining hydration and fluid balance, which influence circulation, temperature control, digestion, and kidney function. It also reduces exposure to microorganisms that can cause diarrhoeal and other water-borne infections. In healthcare settings, drinking water, water used for food preparation, and water used for hygiene must all be clean and handled safely.

Milk is one calcium source, but it is not the only one. Depending on dietary preference and health needs, calcium may also come from fortified foods, yoghurt or other tolerated dairy products, tofu made with calcium salts, some fish, or suitable plant foods. The total diet and absorption should be considered, so option A is correct.

Clean, safe water is needed for washing ingredients, cooking food, preparing beverages, making ice, and cleaning utensils. If water contains harmful microorganisms or chemical contaminants, it can introduce disease-causing agents into food and cause water-borne or food-borne illness. Using safe water therefore supports hygiene and infection prevention. It does not aim to change colour or remove nutrients. Option B is correct.

Bananas and coconut water can contribute a considerable amount of potassium. In some patients with impaired kidney function or abnormal blood potassium, excessive potassium may increase the risk of dangerous heart and muscle effects. Restriction should never be automatic; it should be based on laboratory results, kidney status, medicines, and professional dietary advice.

A low-residue diet restricts foods that contribute substantial stool bulk, often including many whole grains, raw vegetables, fruit skins, seeds, and some pulses. If continued longer than clinically necessary without review, total fibre, vitamin, mineral, and sometimes energy intake may become inadequate. The diet should have a clear indication, appropriate duration, sufficient fluids when allowed, and professional reassessment before liberalization or continuation.

Refining removes the bran and germ from grains, and these parts contain much of the fibre, vitamins, minerals, and beneficial plant compounds. A diet based only on refined cereals may therefore provide less dietary fibre and some micronutrients than a diet containing whole grains. It does not automatically mean excess fat, excess water, or zero salt intake.

Waterborne diseases spread through water contaminated with organisms such as bacteria, viruses or parasites. Education is especially needed when people do not understand the importance of safe drinking water, boiling or treating doubtful water, protected storage and hygienic handling. Preventing infection also protects nutritional status because illness can reduce appetite and nutrient absorption.

Unsafe drinking water may contain pathogens that cause diarrhoea and other waterborne illnesses. Repeated diarrhoea can reduce food intake, impair nutrient absorption, and increase nutrient losses, especially in children. Safe water is therefore an essential part of protecting nutritional status and care.