An apple a day keeps the doctor away

Apple is expensive now so how about a dragon fruit a day.

I seem to recall reading that the saying was actually a marketing ploy intended to sell more apples.

The saying originated in countries where apples are common and cheap. You can easily get the same benefits from fresh fruit which is readily available and cheap in your country. The main benefits of apples are that they contain Vitamin C, types of sugar which is readily assimilable and fibre. All of these are good for the health and all can be found in other fruits as well.

Yes, just like you apples are not indigenous in our country too , so we import them and they can be expensive specially those big Fuji apples . I like eating Fuji apple. I believe it can keep the doctors away indeed if we eat an apple everyday .

We cannot change the idiomatic expression.

No, it can be guava. Apples sell at exorbitant prices so we can very well have guavas or gooseberries or any local fruit...maynot have the same properties as apples but fruit is good.

true apple does benefit the health..