According to Mashed, McDonald's Bacon, Egg, and Cheese Biscuit is a good example of the nutritional content you can expect in a breakfast sandwich there.
The article explains,"[I]t has 450 calories, which isn't too terrible, but it also has 24 grams of fat — that's 37 percent of your daily recommended intake. And it has a whopping 1,290 milligrams of sodium, which is over half of your recommended daily sodium intake in one sandwich."
Plus, according to this article, you can expect this from pretty much every McDonald's breakfast sandwich.
Even the "healthy" breakfast options, which cut down on the calories and fat, are high in sodium.
According to Cheat Sheet, which ranked the healthiest McDonald's breakfasts, some low-calorie favorites still pack in the sodium. The Egg White Delight McMuffin has 750 grams of sodium; the Sausage Burrito has 800.
Both of these options are under 300 calories, and put in the category of top 5 healthiest McDonald's breakfasts, yet they are still very high in sodium.
Too much sodium, which mostly comes from restaurant meals and processed foods, can lead to an array of health problems. According to the CDC, "Eating too much sodium puts Americans at risk for developing serious medical conditions, like high blood pressure, heart disease, and stroke."
With that in mind, avoiding breakfast sandwiches from McDonald's altogether is probably a good idea. If you are in need of a breakfast on-the-go, try their yogurt parfait or fruit cup instead.