Where does it come from?

To have what you've never had you must do what you've never done.  You don't always get what you want out of life, but you generally get what you expect.  If you exert effort to learn things, you likely anticipate benefits, results, a desire for change, or some kind of reflection of what you put in.  If you don't reap rewards, you may feel like you're missing out or doing something wrong.  When you sense your choices make a positive difference, you gain confidence in the choices.  If you make no effort to learn about 'why' you do things, you can't expect your life to change.

Consider who teaches you, what you are choosing to learn or to discard as unimportant details.  Consider your lifestyle choices as a reflection of your values.  What you buy says a lot about your taste preferences, what beliefs or lifestyles you support and how you feel about all the industries, politics and economic systems that keep these products available and affordable at your level.

Think about where you live and the local climate.  If you live in a place where it snows, remind yourself how fresh fruits and vegetables are grown far away and transported in trucks, planes or ships to where you are. Anything not produced where you are comes with cost to society which goes beyond simply financial.  Modes of transport need gas to function, roads or runways or ports to be built to process the incoming cargo.  Gas-production and gas-propelled transport create pollution and environmental problems.  Economies of countries that grow and produce what you eat, at least in the off-season, may be paid less than what you would pay local people to grow similar produce. Buying products at lower prices from offshore may put local people out of work.

If you choose to be a strict vegetarian because you feel eating animals goes against your principals, it would be inconsistent to wear clothing or use other items made from animal products.  Yet, some people say one thing and hypocritically do others. 

Step back and follow the thread that connects your beliefs with your choices.  Are you buying things which are consistent with how you feel about what you've learned about the world? You may be willing to spend more money for bio-degradable products because you care about the environment, yet do you also recycle and do what you can to help the environment in other ways? Learn the origins of things and take the time to learn why you think and act as you do.