" You can tell a lot about a fellow's character by his way of eating jelly beans" (Ronald Regan, ex-president of the USA.) How far do you agree with this?

I am absolutely agree with this quote about jelly beans. It is very interesting one. You can see "body language" everywhere. 

To start with I want to say that Jelly Beans are the ultimate way to tell what someone is feeling. The way they chew can express disappointment, anger, love, happiness, and lust. For example the open mouth chew is most commonly linked to lustful thoughts. A fierce hard chew is anger. A closed mouth subtle chew with a smirk strewn across one's face can indicate love or happiness. A frown and fast chew indicates disappointment.

In my opinion a common reason for comparing the character and how a person eats is that the brand Jelly Bean also can indicate one's social status. For example, poorer people will eat grocery store brand Jelly Beans. A middle class family will go for Starburst Jelly Beans, or candy store Jelly Beans. However, a wealthy family will indulge on Jelly Belly's.

Furthermore, the flavor and color of the Jelly Beans they chose to eat can indicate temperament and possible chemistry. Red Jelly Beans that are cinnamon or apple indicate a warm and loving personality, while Red with a spicy flavor indicate a deep seeded anger, yet can also mean that the person is mysterious. Green Jelly Beans indicate horniness and openness. Blue can indicate either sad or a go with the flow type personality depending on the flavor. Yellow usually means the person is prudent, or they have to urinate. 

All in all,  Jelly Beans are like no other food in that they can show almost every emotion and personality type.  I think that this is very easy and useful just know how and what people eats.