A Big Mac contains 540 calories and 25 grams of fat. Consuming this sandwich alone – without the fries and soda that often accompany it – makes up more than 25% of an adult's daily recommended calorie intake and over 40% of the recommended daily fat intake.

What does a Big Mac do to your body?

Junk food like the Big Mac triggers your brain's reward system by releasing "feel-good" chemicals, such as the neurotransmitter dopamine. The process works in a similar way to the reaction you'd get after taking a drug like cocaine and raises the likelihood of compulsive eating.

What is the unhealthiest thing at Mcdonald's?

These 10 items will pack the biggest caloric punch.