Our expert says:
I agree with your friend. Please keep in mind that the reason why I and my dietetic colleagues have a problem with high-protein diets is that such diets automatically will expose you to high levels of fat, saturated fat and cholesterol because all animal protein foods such as meat, eggs and poultry contain animal fats which in turn contain these 'bad' fats which in turn can exacerbate high blood cholesterol and lipid levels predisposing to heart disease and certain cancers. A high protein intake may also have a negative effect on kidney function and leach calcium out of the body. There is also not yet sufficient evidence that shows that these high-protein diets sustain weight loss in the long-term, which is after all the purpose of trying to lose weight. Then there is also the problem of a lack of protective nutrients (bioflavonoids, phytochemicals, etc which are mainly found in plant foods) and dietary fibre, so that using a high-protein diet for long periods can cause certain deficiencies and constipation. So, if it works for you and you don't use it for longer than about 2 weeks at a time, then that is fine. but please be aware of the potential dangers of such diets. You should still be getting at least 1-2 portions of carbohydrates with a low glycaemic index (GI) at each meal to supply you with fibre and readily available energy.
If you want an example of individuals who are thin and fit and obtain up to 70% of their energy from carbs, then consider the cyclists who participate in the Tour de France. Luckily most individuals who use these potentially harmful ketogenic diets stop using them after awhile because the human body is designed to function on a balanced diet which contains all the macronutrients, namely carbohydrates, protein and some fats. Pronounced ketosis is actually a medical emergency in patients with diabetes and can result in coma and death, so please be careful.
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