This is the 9907th most frequent Turkish word.
azalttığı
"Azalttığı" means "that [someone/something] reduces" or "the thing [someone/something] decreases."
In this sentence, "azalttığı" is a relative clause structure indicating the action of "reducing" attributed to the methods.
Fabrikaların kullandığı yöntemler hava kirliliğini azalttığı için daha sık tercih edilir.
The methods used by factories are preferred more often because they reduce air pollution.
Here, "azalttığı" indicates the action of "reducing" sugar levels as an effect of following the diet.
Doktorun önerdiği diyet, hastanın şeker seviyesini azalttığı için uygulanır.
The diet suggested by the doctor is applied because it reduces the patient's sugar levels.
In this example, "azalttığı" marks the reduction effect caused by using the bulb.