True for freshly ripe bananas, but black spots will start appearing a few days later, only for the naturally ripened ones.

If the bananas remain Yellow throughout (of course with some greenish patches), it's likely they have been poisoned.

Stages of naturally ripened bananas:



After several days- good banana:


After several days- bad banana:

Warm lemon juice can be mixed with other items for a particular health relieve.
If mixed with natural honey provides relieve for cold and cough and the efficacy is better than Orthodox tablets or syrups .

Ideally considering the health benefits of lemon it should be worth at least 5 times the price.
The fact remains most people do not know the its immense health benefits.

i read somewhere that

However, the acid in lemons can damage your tooth enamel over time, which makes your teeth more prone to cavities. You can manage this easily by drinking lemon water with a straw whenever possible, to avoid contact with your teeth

To safeguard your teeth the best way to take lemon juice is in diluted warm water.
You have to squeeze a full lemon juice and dilute it on half or full glass of WARM water.