In the realm of nutrition, the focus often falls on the contents of our plates. Yet, as Samantha Peterson, MS, RD, a registered dietitian, emphasizes, the way we prepare our food is equally crucial. “Even our well-intentioned daily cooking habits can subtly diminish the nutritional value of our meals,” Peterson remarks. This extends to both the preparation and presentation of meals, which can influence factors such as nutrient content and absorption.
The silver lining is that minor adjustments can yield significant benefits. Intrigued? Continue reading to uncover cooking habits that might be compromising your nutrition, and the alternatives suggested by nutrition experts.
Samantha Peterson, MS, RD, a registered dietitian and founder of Simply Wellness; Helen Tieu, RD, MAN, CDE, a registered dietitian and certified diabetes educator, and founder of Diet Refined; Julie Pollock, PhD, associate professor of chemistry and a biochemist at the University of Richmond
For many, peeling fruits and vegetables is a standard step in meal preparation. Whether it’s to eliminate pesticide residues or enhance texture, this practice is widespread. However, if you’re aiming to boost your nutrient intake, you might reconsider this step when dealing with certain produce.
Peterson explains, “The outer layer of fruits and vegetables like apples, cucumbers, carrots, and potatoes is abundant in fiber, crucial for healthy digestion and blood sugar regulation.” These peels also contain antioxidants and phytochemicals, plant compounds that combat inflammation and shield cells from damage. “Removing the skin means discarding some of the nutrients that make these foods so beneficial for gut, heart, and immune health,” Peterson adds.
Instead, Helen Tieu, RD, MAN, CDE, advises, “Wash fruits and vegetables thoroughly and retain the skin whenever possible to preserve nutrient levels.” If texture is a concern, she suggests light cooking instead of peeling. Methods such as roasting, sautéing, and blending can soften the peel and make it less noticeable, while still allowing you to reap the benefits, Peterson notes.
While boiling can make vegetables more digestible, it’s possible to overdo it. Tieu explains, “Over-boiling vegetables can cause water-soluble vitamins like vitamin C and certain B vitamins to leach into the cooking water.” Unless you’re using this liquid, these nutrients won’t end up on your plate, Peterson notes.
To safeguard the nutritional value of your vegetables, Tieu recommends boiling for a shorter duration. Stop when the vegetables are a vibrant color and tender but not mushy. “This indicates they are cooked to perfection without losing most of the vitamins,” Peterson clarifies. Another tip is to use less water and repurpose it for soups, stews, or sauces to reclaim some nutrients, Peterson suggests. Alternatively, steaming, sautéing, and gentle roasting are ideal cooking methods to maximize nutrient retention, Tieu says.
After years of emphasizing “fat-free” and “low-fat” diets, fat has garnered a negative reputation. However, avoiding fat isn’t always the wisest choice. Fat is an essential macronutrient and aids in the absorption of vitamins A, D, E, and K, which are fat-soluble. Peterson explains, “Fat stimulates the release of bile and carriers in your digestive system, which transport these vitamins into your bloodstream.” Without fat, nutrients like beta-carotene in carrots, vitamin K in leafy greens, and vitamin E in spinach or peppers are less likely to be absorbed.
Cooking food to the point of charring might seem appealing for its crispy texture and smoky flavor, especially when grilling or roasting meat. However, Tieu warns, “High-heat frying or charring can destroy heat-sensitive vitamins such as vitamin C and some B vitamins, and may also produce harmful compounds like acrylamide in starchy foods.” Charring meat can also create chemicals like heterocyclic amines (HCAs) and polycyclic aromatic hydrocarbons (PAHs), which are associated with inflammation and potential long-term health risks, Peterson points out.
Instead, Tieu suggests using methods like light sautéing, roasting at lower temperatures, or air frying to achieve a crispy texture without excessive nutrient loss. Opt for a golden-brown color rather than blackened, Peterson adds. For that smoky flavor, consider using spices like smoked paprika instead of relying on a deep char.
It’s no secret that pre-cutting fruits and vegetables saves time, making healthy ingredients more accessible throughout the week. However, cutting too early can diminish their nutritional value. Peterson explains, “Once produce is cut, the exposed surfaces begin to oxidize, breaking down delicate vitamins like vitamin C and folate.” This is why pre-cut lettuce, apples, and carrots lose color, crispness, and nutrition more quickly, she adds.
To maintain the nutritional quality of your produce, wait to cut it until necessary. Peterson advises, “If you need to prepare ahead, store it in airtight containers, wrap cut fruit tightly, and add a squeeze of lemon juice to slow down browning.” Storing carrots and celery sticks in water in the fridge can also keep them fresh and crisp.
