求翻译：保持饮食中的营养平衡： 有益于健康的饮食应该是维生素和矿物质含量丰富而饱和脂肪酸含量低的食物，如绿色蔬菜、水果以及蛋白质含量高的鱼、家禽、瘦猪肉和牛羊肉等。现代营养学家研究证明，缺乏铁、铜等矿物质，会引起头发过早变白，应多吃动物肝脏、蛋黄、黑芝麻、核桃、黄豆等；头发脱落过多应补充蛋白质以及钙、铁、硫等多种微量元素，如黑豆、蛋、奶、黑芝麻等食物。此外，过多吃甜食、脂肪，会促使体内血液偏于酸性而导致头发干燥、变黄。多吃新鲜蔬菜和水果，是保护头发的有效方法之一。是什么意思？

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In maintenance diet nutrition balance: But is beneficial in the health diet should be the Vitamin and the mineral substance content rich saturated fatty acid content low food, like green vegetables, fruit as well as protein content high fish, domesticated fowl, thin pork and cow mutton and so on.The

Maintaining dietary nutrient balance: healthy eating should be abundant vitamin and minerals and food with low saturated fatty acids, green vegetable and fruits and protein content high, thin fish, poultry pork and mutton. Modern nutrition studies prove that lack minerals such as iron, copper, cause

Keep balance of nutrients in diet: healthy diet should be low vitamin and mineral content rich and saturated fatty acid content of foods, such as green vegetables, fruit and high protein content of fish, poultry, lean pork and beef and mutton. Modern nutrition studies prove that lack minerals such a