1. Dietary Supplements
If you love fizzy vitamin and mineral tablets, be careful because they significantly increase your appetite. This is a common bodily reaction when there's an excess of something in the body. The same effect can also be found with other supplements like Vegeta (a seasoning), pre-made spices, sauce additives, and similar products.

2. Medications
It’s true that people react differently to medications, but some of the drugs we take for everyday issues have the side effect of increasing hunger. This is especially true for antidepressants and medications that relieve headaches.

3. Fitness Routine
If you regularly maintain your fitness, your body adapts to your workout regime, but any change can trigger an increase in appetite. The body prepares itself for new challenges and strains this way. However, it’s true that the body quickly adjusts, and the appetite becomes manageable again.

4. Cold Weather
Since ancient times, when the weather got colder, people ate more. It’s an evolutionary reflex that can’t be avoided. The body needs more fat reserves for winter to maintain temperature. It's worth adding that something similar happens in the summer when you enter an overly air-conditioned room with an overheated body. Even in that case, the body reacts by increasing appetite. So, we can simplify by saying that air conditioners can also make you gain weight.