Experts say that overdoing it with certain nutritious foods can be really dangerous, even life-threatening. There’s no need to ditch these foods from your diet altogether, but you have to avoid taking in excessive amounts since that’s when they can start to compromise your health.

Oranges and tomatoes: You’ve got to be careful to not overindulge with these delicious but highly acidic summer staples. The increased acid intake associated with eating too many oranges or tomatoes can lead to reflux, and over an extended period of time, this can cause Barrett’s Esophagus, a disorder in which precancerous lesions form on the esophageal lining. Stick to no more than two servings of oranges or tomatoes a day, and avoid these foods altogether if you already have symptoms of reflux.

Canned tuna: This easy-to-prepare, low-cal fish is a healthy salad or sandwich go-to. However, eating too much of it can result in dangerous mercury levels since tuna is higher in mercury than many other fish. Excessive mercury intake can lead to vision problems, impaired hearing and speech, lack of coordination, and muscle weakness. Make sure you don’t consume more than three to five cans of tuna a week, and try other fish.

Water: While hydration is key to good health, excessive water consumption can cause water intoxication. This happens when extreme water intake dilutes the sodium in the body, resulting in an abnormally low blood sodium level, which can lead to impaired brain function and even death. Yes. Water can kill you. How much water would you have to drink for this to be an issue? It’s typically only a problem for ultramarathoners and people who force themselves to over-drink. But to make sure you’re not consuming too much water, check your urine: If it’s always transparent, reduce your intake.

Soy: While soy can help control cholesterol levels and blood pressure when consumed in moderation, it also inhibits iron absorption, so excessive intake has the potential to cause iron-deficiency anemia. Also, because soy contains estrogen-like compounds (isoflavones), long-term consumption of large amounts has the potential to cause endometrial hyperplasia, a proliferation of the uterine lining that can lead to uterine cancer. While there’s no exact cutoff for how much soy is safe, you probably want to stick to two servings per day or less.

Spinach: This versatile and delicious leafy green is packed with goodness: It’s an excellent source of protein, fiber, and various vitamins and minerals. Spinach is also high in lutein, a carotenoid that may help prevent age-related macular degeneration (a common cause of vision loss and blindness). However, spinach is also high in oxalate, a compound that can lead to the formation of kidney stones—so patients with calcium oxalate kidney stones should avoid overdoing it with this vegetable.

[size=13pt]Source: dindindara[/size]