General exercises refers to people who participate in lower intensity training, this is where glycogen is possibly lost and greater amounts of fat will be used. There are also guidelines regarding general exercise. These are to aim to stay within the energy balance, not mixing high carbs with high fat though try to provide energy that can be metabolised, smaller portions and also having meals often favour the oxidation of the nutrients, the micronutrients should be high, aim to create an energy deficit of 250 calories if trying to lose body fat, also fulfil carbohydrate needs (moderate/low GI foods), EFA's should be eaten in balance, must include adequate protein and also fibre should be high.
Isotonic drinks replace the fluid and provision of fuel which comes in the form of carbohydrates. This can help to maintain reasonable hydration and provide a faster rate of absorption. They have electrolytes/salts lost through increased sweating during exertion which are all necessary. However, isotonic drinks sometimes have artificial sweeteners added to them. It can also be recommended to create your own sports drinks which you would do by: dissolving 60g of glucose into 1 litre of water and then adding a fifth of a teaspoon of unprocessed natural salt. You can also mix 500ml of water with 500ml of fruit juice (unsweetened) and then adding a fifth of a teaspoon of unprocessed salt which is natural.
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