First, make the liver fat.
Fructose can accelerate the storage of fat in liver cells. Long-term high-sugar diet will make fat gather around the liver like small balls, which is a precursor of "nonalcoholic fatty liver".
Second, make you a king of big stomachs.
Eating too much sugar for a long time will disturb the body to send signals to the brain. Overweight and type 2 diabetes patients, the body will slow down the release of leptin hormone, leading to satiety but still hunger.
Third, induce headaches.
When you eat too much sugar, the human body needs to respond quickly, and the blood sugar level will suddenly peak and then fall into a trough. This change may cause headaches.