Sunny side up eggs are a nutritious choice, packed with protein, healthy fats, and hard-to-find nutrients like choline. The one real trade-off is food safety: because the yolk stays runny, it never reaches the temperature needed to kill bacteria like Salmonella. For most healthy adults, that risk is low, and the nutritional benefits are substantial.
What You Get From a Sunny Side Up Egg
A single large egg delivers about 6 grams of protein, 5 grams of fat, and only 70 calories. The white provides most of the protein, while the yolk carries the bulk of the vitamins, minerals, and fat. That fat is mostly the heart-friendly kind: roughly 48% monounsaturated (the same type found in olive oil), about 16% polyunsaturated, and 36% saturated. It’s a better ratio than many people expect from an animal product.
The yolk is also one of the richest food sources of choline, a nutrient most people don’t get enough of. One large egg contains about 147 mg, which covers more than a quarter of the daily recommended intake. Choline is essential for producing a brain chemical involved in memory, mood, and muscle control. In a study of nearly 1,400 adults from the Framingham Heart Study, those with higher choline intakes performed better on tests of verbal and visual memory. During pregnancy, adequate choline supports early brain development and helps reduce the risk of neural tube defects.
Egg yolks also contain lutein and zeaxanthin, two pigments that accumulate in the retina and help protect against age-related vision problems. The fat in the yolk actually helps your body absorb these pigments more efficiently than you would from plant sources like spinach.
How Cooking Style Affects Nutrition
The sunny side up method cooks the white on a hot pan while leaving the yolk liquid. This matters nutritionally in two ways, and the news is mostly good.
First, cooking the egg white dramatically improves protein absorption. A study published in the Journal of Nutrition found that cooked egg protein has a true digestibility of about 91%, compared to just 51% for raw egg protein. Since the white in a properly cooked sunny side up egg is fully set, you’re getting the full protein benefit.
Second, keeping the yolk runny means less heat exposure to its delicate nutrients. Choline is relatively heat-stable, so you won’t lose much regardless of how you cook it. Lutein and zeaxanthin may be slightly better preserved in gentler cooking methods like poaching or leaving the yolk soft compared to high-heat preparations like omelets, though the differences are modest.
Where sunny side up really shines is in what you don’t add. Unlike scrambled eggs, which often call for butter or cream, or fried eggs that get flipped into more oil, a sunny side up egg needs only a light coat of oil or cooking spray. That keeps the calorie count low and lets the egg’s own nutrition take center stage.
The Runny Yolk and Salmonella Risk
The main health concern with sunny side up eggs is the uncooked yolk. The FDA recommends cooking eggs to an internal temperature of 145°F (63°C) for at least 15 seconds to kill Salmonella. A runny yolk doesn’t reach that threshold.
Fresh eggs, even those with clean, uncracked shells, can contain Salmonella bacteria. When infection does occur, symptoms typically include diarrhea, fever, abdominal cramps, and vomiting, usually starting 12 to 72 hours after exposure and lasting 4 to 7 days. Most healthy adults recover without treatment. But for young children, older adults, pregnant women, and people with weakened immune systems, the infection can become severe enough to require hospitalization.
If you fall into one of those higher-risk groups, cooking eggs until both the white and yolk are firm is the safer choice. For everyone else, the risk from a sunny side up egg is low on a per-egg basis, though it’s not zero. Buying eggs from refrigerated cases, storing them at or below 40°F, and cooking them soon after cracking reduces the odds further.
Eggs and Heart Health
For years, eggs had a reputation problem because of their cholesterol content (about 186 mg per large egg, all in the yolk). That led to blanket advice to limit egg consumption. The science has shifted considerably since then.
The American Heart Association’s 2026 dietary guidance states that dietary cholesterol is no longer a primary target for cardiovascular risk reduction for most people. Moderate egg consumption can be part of a heart-healthy eating pattern. The bigger concern, the AHA notes, is what you eat alongside your eggs. Pairing them with bacon, sausage, or other processed meats adds saturated fat and sodium that do affect heart risk. Sunny side up eggs served with whole-grain toast, avocado, or vegetables are a different nutritional picture entirely.
Making Sunny Side Up Eggs Healthier
Small choices in preparation can shift the health profile of your meal. Use a nonstick pan or a small amount of olive oil rather than butter to keep saturated fat low. Cooking on medium-low heat gives the white time to set completely without burning, which maximizes protein digestibility while keeping the yolk soft.
What you pair with the egg matters as much as the egg itself. A sunny side up egg on sautéed greens or a bed of roasted vegetables turns a simple egg into a meal with fiber, potassium, and additional vitamins. The fat in the yolk actually helps your body absorb fat-soluble vitamins from those vegetables, so the combination is more nutritious than either food alone.
If you eat eggs regularly, varying your sources can improve the fat profile. Eggs from free-range hens tend to have a higher proportion of polyunsaturated fats (about 23% of total fat versus 16% in conventional eggs), including more omega-3 fatty acids. The difference comes from the hens’ diet, particularly access to grasses and insects.