Counting calories and watching what you eat in regards to your waistline is one thing. It’s also obviously in your best interest to avoid foods that will negatively affect your heart and cardiovascular health. But, are you aware that many foods of the foods you put into your body are directly upsetting your brain? The head on your shoulders is arguably your most prized possession. So here’s a list of foods that you’ll want to watch out for.   TUNA Yes. Sorry. But tuna tops the list. While many health experts have stressed tuna as a very smart and healthy food choice, and for the most part, it really is, the problem lies in the amount of mercury in the fish. Having a high-level of mercury in your bloodstream can cause a decrease in cognitive brain function. You don’t have to stop eating tuna altogether, but it should be consumed in moderation. Need your seafood fix? Salmon, sardines and many types of white fish are low in mercury and still boast the same essential omega-3s that tuna offers.   SUGAR Looking for a quick boost of energy from sugar? Look elsewhere. The immediate effect of sugar may seem great, but you will crash very quickly. Sugar can cause insulin levels to spike and inflammation that can lead to vascular and neuronal damage in your brain. A study from Brain, Behavior, and Immunity cited that sugar can promote inflammation of the memory control center of your brain, known as the hippocampus. This means it can’t function at 100%. Try your best to avoid unnecessary sugar in your diet.