Women's Nutrition Across Life Stages: Dr. Hazel Wallace on Hormones, Biomarkers, and Healthspan

Most nutrition research has been conducted on male bodies. That means the guidance women receive about what to eat and when is often incomplete. Dr. Hazel Wallace, a medical doctor and registered nutritionist who serves on the WHOOP Medical Advisory Board, has built her career on bridging this gap. In episode 365 of the WHOOP Podcast, WHOOP SVP of Research, Algorithms, and Data Emily Capodilupo and Dr. Wallace break down why women's nutritional needs differ fundamentally from men's, how hormonal milestones shape those needs, and what symptoms might signal your nutrient status needs attention.

Why is women's nutrition different from men's?

The short answer is hormones. However, the topic is more complex than many people realize. "Women do have completely different requirements to men, and we have a different hormonal profile which changes throughout our lifespan," Dr. Wallace explains. These hormones — primarily estrogen and progesterone — don't just regulate your cycle. They influence mood, metabolism, nutrient needs, gut health, strength, and energy. 

This matters because the daily value percentages on food labels, the dietary guidelines most doctors reference, and the majority of nutritional research all stem from studies conducted primarily on men. When women follow this advice, they're essentially following recommendations designed for a different biology. 

The hormonal milestones that shift women's nutritional needs include puberty and the onset of menstruation, pregnancy and postpartum recovery, breastfeeding, and perimenopause through menopause. Each stage brings distinct requirements that generic nutrition advice simply doesn't address. Hear Dr. Wallace explain the research gap in women's nutrition in the full episode.

How do nutritional needs change across the menstrual cycle?

Your monthly hormone fluctuations significantly shift what your body needs. During the bleeding phase of your cycle, when estrogen and progesterone are both low, you're losing iron that needs to be replenished. Dr. Wallace recommends pairing iron-rich foods with vitamin C sources like bell peppers or citrus fruits to enhance absorption. This phase can also bring gut symptoms due to prostaglandins (inflammatory markers), which may cause loose stools. If you're experiencing digestive discomfort during menstruation, consider moderating caffeine, spicy foods, and sugar-free products that can increase gas and worsen symptoms. For athletes, hydration becomes especially important during this time.

In the luteal phase (roughly two weeks between ovulation and your period), progesterone rises and insulin sensitivity tends to decline. Research suggests resting metabolic rate can increase. If you're hungrier during this phase, your body may genuinely need more fuel. 

Balanced meals combining fiber-rich carbohydrates with protein and fat can help stabilize blood glucose and reduce the cravings and mood swings many women experience premenstrually.

Learn more about cycle-aware nutrition strategies in the podcast.

What changes at menopause?

The drop in estrogen during perimenopause and menopause creates significant shifts in nutritional priorities. Estrogen isn't just a reproductive hormone. It's also critical for bone health and cardiovascular function. "We often say heart disease is a man's disease, but women also experience heart disease after menopause," Dr. Wallace notes. "We're more at risk because we have that drop in estrogen." This means postmenopausal women need to pay closer attention to calcium and vitamin D for bone health, protein intake to support muscle mass, fiber for cardiovascular health, and monitoring blood pressure and cholesterol more closely. The cardiovascular risk increase is substantial enough that Dr. Wallace emphasizes it warrants proactive attention rather than waiting for problems to develop. The podcast covers perimenopause nutrition strategies in detail.

What symptoms might signal a nutrient issue?

Here's where things get frustrating: the symptoms of suboptimal nutrient status are vague. They're easy to dismiss or attribute to stress, aging, or just having a busy life. Dr. Wallace describes what to watch for: "Feeling more fatigued, finding it harder to recover from workouts, finding that you're picking up more illnesses like the common cold more frequently than you normally would. Finding your energy dipping in the afternoon, things like hair loss, skin changes, joint aches and pains, brain fog." The challenge is that these symptoms exist on a spectrum. You can be suboptimal without being clinically deficient, meaning your doctor might tell you everything looks fine while you still feel off. WHOOP Advanced Labs analyzes key biomarkers alongside your daily WHOOP data, helping you connect lab results with trends in your recovery, sleep, and strain. Even if your biomarkers come back normal, you've ruled out one variable and can focus on other factors like sleep quality or stress management. Dr. Wallace shares more about interpreting vague symptoms in the full conversation.

The bottom line

Dr. Wallace's approach comes down to a simple principle: the nutritional needs of women are nuances, and should be treated that way. The practical takeaways:

• Hormonal milestones matter. Puberty, pregnancy, postpartum, and menopause all shift your nutritional needs in specific ways.
• Vague symptoms deserve attention. Fatigue, poor recovery, frequent illness, and brain fog can signal suboptimal nutrient status even when you're not clinically deficient.
• Doctors aren't nutritionists. If you've received major dietary advice from an MD, consider validating it with a registered dietitian or nutritionist.
• Testing provides clarity. Biomarker testing can either identify issues to address or rule out nutrient status as a factor, letting you focus elsewhere.
• Consistency beats extremes. Rather than dramatic dietary overhauls, focus on sustainable patterns that support your current life stage.

WHOOP helps you track how your daily behaviors, including nutrition, impact your body. By connecting what you eat with how you feel and recover, you can start making more informed decisions about nutrition through every phase of life. Listen to the full conversation with Dr. Hazel Wallace on the WHOOP Podcast for deeper insights on women's nutrition, biomarker testing, and building sustainable health habits.