Not only do sugary sodas (also lemonade and sweet tea) provide us with very little nutrients, but one 12-ounce can contain a staggering 35 grams of sugar. Like sugary treats, soda can stimulate the release of dopamine too. Add caffeine and you’re getting a double-energy hit. “Once you’re hooked on caffeine, you can suffer symptoms of withdrawal if you try to stop, including sluggishness, headaches, and emotional distress,” says Mashru.