Here is what happens in an hour after drinking a 330ml can of Coca-Cola:
Within 10 minutes: Ten teaspoons of sugar (over 166 percent of your daily recommended sugar intake) hit your system. You do not vomit from the over-sweetness because phosphoric acid in the drink drowns the flavor.
20 minutes later: Your blood sugar spikes causing a flood of insulin into the blood stream. This extra insulin leads you liver to convert the blood sugar into fat.
40 minutes later: The caffeine in the cola is almost completely absorbed by your body, your blood pressure rises, eyes dilate and the adenosine receptors in your brain are blocked preventing any feeling of fatigue. Your body increases the production of dopamine that stimulates the pleasure centers of the brain, a response similar to the body absorbing heroin.
60 minutes later: The phosphoric acid in the coke binds calcium, magnesium and zinc in your lower intestine providing a further boost in metabolism. This is compounded by the high doses of sugar and other artificial sweeteners increasing the urinary excretion of calcium.
After 60 minutes: As the high inside your body begins to evaporate you will have a sugar crash causing you to become irritable and probably sluggish. The caffeine’s diuretic (urine producing) properties now come into play and you piss away valuable nutrients, such as the bonded calcium, magnesium and zinc essential for strengthening your bones, as well as sodium, electrolytes and water needed to hydrate and maintain proper functioning of your body’s systems.
While this infographic from British pharmacist Niraj Naik shows what happens specifically from consuming a can of Coca-Cola, the same could happen from consuming other soft-drinks.