According to Nutritionists, You Shouldn't Eat These 9 Foods Every Day

According to Brigitte Zeitlin, MPH, RD, a registered dietitian in New York City, tuna is a great source of protein and makes for a great, quick protein addition to your lunch or dinner. However, as with all fish and shellfish, you should keep track of the amount you eat and keep in mind eating too much of it could lead to mercury accumulation. The FDA recommends pregnant women and children eat only up to 12 ounces (or two meals) of light canned tuna a week.

"Mercury poisoning can give you bad headaches, impair your speech, walking, and hearing, slow your cognitive function ,and lead to drastic mood swings, so it's definitely something we want to avoid," said Zeitlin. "It is best to keep your tuna to just one or two meals a week, and supplement with other fish, like salmon, halibut or cod."

Animal-based proteins can be part of your healthy diet, "but it's a great idea to try to make one or two days a week plant-based days," said Zeitlin. By adding more vegetable-based meals to your diet, "You'll up your fibre and antioxidant intake, which can help prevent heart disease, diabetes, inflammation, and other chronic illnesses." She advised getting your plant-based protein from hemp hearts, lentils, chickpeas, peas, edamame, and beans. You can also add a plant-based protein powder to your morning oatmeal or smoothies.

"Kombucha can be a great source of probiotics, and generally speaking, probiotics are helpful for fighting belly bloat," said Zeitlin. "Since this drink combines the gut-helpers with carbonation, it can backfire, as carbonation usually leads to feeling bloated and gassy. Additionally, kombucha can be acidic, so if you have any sort of reflux, this drink may make it worse." She suggested that you only drink half a bottle at time and space it out during the week instead of consuming it every day.