In daily diets, foods high in nutrients are often thought to be beneficial to health when consumed in larger quantities. However, as the saying goes, too much of a good thing can be bad, and this is especially true for nutritional intake. While some foods are indeed healthy, excessive consumption can lead to adverse consequences. The following foods are not recommended to be eaten in excess, so let's get to know them better!
Oranges and tomatoes are sweet, sour, and nutritious. However, Gina Sam, director of the Gastrointestinal Motility Program at Mount Sinai Hospital in the U.S., points out that oranges and tomatoes are highly acidic foods. Eating too many can cause gastroesophageal reflux, and over time, it may even lead to esophageal lesions. Sam advises that the average person should not eat more than 2 servings of oranges or tomatoes per day (one serving is about the size of a fist), and if you already have symptoms of gastroesophageal reflux, it's best to avoid them.
Tofu
Tofu is one of the most common ingredients, but Dr. Alan Gaby, author of "Textbook of Nutritional Medicine," points out that soybeans, the main ingredient in tofu, can help control blood pressure and cholesterol levels. However, consuming too much can inhibit the body's absorption of iron, which, especially for women, may lead to iron-deficiency anemia. Experts state that there are no exact figures on how much soy is too much, but a safer approach is to consume no more than 2 servings per day (about 400 grams).
Spinach
Spinach is an excellent source of dietary fiber, multiple vitamins, minerals, and plant protein. It is also rich in lutein, which helps prevent age-related macular degeneration and protect vision. However, spinach contains a significant amount of oxalic acid, a compound that can lead to kidney stones. Patients with calcium oxalate kidney stones should eat less spinach or avoid it altogether. Before cooking, it is best to blanch spinach in boiling water first, which can remove most of the oxalic acid.
Tuna Cans
Tuna cans are convenient and delicious. Sam points out that tuna itself is highly nutritious, but due to possible heavy metal pollution in seawater, tuna can accumulate mercury in its body, often at higher levels than other fish. Excessive mercury intake can lead to visual and hearing impairments, as well as problems such as ataxia and muscle weakness. She recommends eating no more than 3-5 cans of tuna per week and suggests substituting it with salmon, cod, shrimp, and other seafood that have similar nutritional value but lower mercury accumulation.
Animal Protein
Protein is an essential nutrient for the human body and plays a crucial role in maintaining muscle levels. It is divided into two categories: animal protein and plant protein. Dr. Joel Fuhrman states that if the primary source of daily protein is animal protein, it may cause changes in insulin levels, accelerate the aging process, and increase the risk of breast cancer. A study published in the journal *Cell Metabolism* found that if 20% of total calories come from animal protein, the risk of death from cancer increases fourfold, and the overall risk of death increases by 75%. Fuhrman recommends not consuming too much meat (animal protein) in the daily diet, but instead replacing it with moderate amounts of plant-based proteins such as legumes, nuts, and grains.