Carbohydrates All food has an energy value. Carbohydrates are essentially sugars and provide a rich source of energy. Simple sugars such as glucose and dextrose are readily available 'instant-energy'. Starches are readily digested into simple sugars and are derived from potatoes, rice, pasta and other common plant and cereal sources. Starches form a major constituent of many diets as they provide a ready energy source that is more sustained and filling than the simple sugars. Non- digestible carbohydrates form fibre and allow your pet to form a bulky faecal stool. Fibre is generally not broken down by simple stomached animals like dogs or cats, but allows digestion of the other nutrients and formation of a regular, firm, healthy stool. Insufficient dietary fibre can often result in diarrhoea and anal gland problems. The requirement for carbohydrates is governed by the weight and activity of our pets. Active animals have a greater need, obese animals and often older animals have much less. Specific diets are formulated to meet these needs, such as Royal Canin's 'Obesity' and various geriatric diets. Animals with poor digestion can be helped by a higher fibre, slower digested diet such as Hills i/d. Diabetic animals also are unable to cope well with simple sugars and require a higher fibre food such as Royal Canin's Diabetic diet, or Hills r/d.

Protein Protein provides animals with essential building blocks, the amino acids, which go to make up muscles but are present in almost all body tissues. Certain amino acids can be synthesised by the animal itself, others cannot and are termed 'essential amino acids'. These must be provided in the diet. Sources of protein are traditionally meat but alternatives are available and dogs can have a balanced meat-free diet. Cereals, chicken, fish and soya are common sources of protein. The protein that our pets eat is largely digested in the bowel and absorbed as the constituent amino acids, which are then broken down and assimilated in the liver and other body tissues. The result is the correct balance of amino acids for the individuals needs, coupled with waste nitrogen products - many of which are excreted through the kidneys. Kidney failure results in the nitrogen waste products failing to be excreted into the urine. Urea is measured in blood to evaluate kidney failure, which affects about 75% of older cats. These cats still have protein requirement to maintain tissue bulk, often high requirements, but it is essential that only the most readily utilized protein is provided through their diet. Diets such as hills k/d utilize specific ingredients to achieve the correctly balanced diet. Growing dogs and active sporting dogs will also have greater requirement provided by life stage diets, available from many manufacturers.

Fat It is essential that diets contain a small amount of fat. Fat provides a more concentrated but less available source of energy than the carbohydrates. This means that a high fat diet can increase obesity but a balanced diet containing fat will satisfy the appetite better than a low fat, high carbohydrate diet. Essential fatty acids are so termed because like the fat soluble vitamins A, D, and E, they cannot be synthesised by the animal but are necessary for normal healthy skin, immune, hormone, and other body systems. Occasionally supplementation is necessary for dry skin conditions. Reputable products such as Efavet capsules and viacutan liquid have been specifically designed for use in dogs and cats. Evening Primrose oil has also been traditionally used as a supplement in many skin disorders If appetite is poor, flavour becomes important and it is fat that adds the flavour to many foods, especially meats. Warming food can also enhance flavour.

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