Just because you’re gobbling down avocados and waking up at the crack of dawn to hit the gym, doesn’t mean you’ve got that washboard stomach you’ve been pining after.

That’s because the science of losing and gaining weight is not exact. While most people claim to understand what it takes to lose weight (but are just too lazy to do it), those who actually try to implement healthier habits may not be having much better luck in the svelte department. Trading in vegetable oil for olive, and replacing pasta with quinoa might push your body into a healthier state, but when it comes to melting fat the major saboteurs may have been flying under the radar this whole time. Here are ten.

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