"Zero calories (卡路里) can't put on weight. " Diet soft drinks are often advertised in this way. But are they really a good choice?
Some people think diet soft drinks are healthier because they don't have sugar or calories. They think drinking these drinks can help them lose weight.
In fact, diet soft drinks do have some sugar, although very little. Usually, when there is 0. 5 grams (克) of sugar or less in a 100 gram drink, we call it a diet soft drink.
Although they have little sugar, diet soft drinks still taste sweet by using artificial sweeteners (人工甜味剂). They have very few calories.
But when you eat sweet-tasting things like sugar, it hits your brain and makes you want more. Your brain tells your body to prepare itself for more sugar. When you drink a diet soft drink, the brain receives the "sweet signal (信号)", but no sugar arrives. Since the brain is fooled, it still wants more sweets.
Some people drink diet soft drinks and they don't drink water. This is not a good choice. Diet soft drinks can make your teeth bad and let you not want to eat. The additives (添加剂) in these drinks are not good for you either.
