Nutrition advice tends to get louder and more confusing the older we get. One decade it’s all about protein, the next it’s hormones, then suddenly everyone’s talking about metabolism like it just… disappeared overnight. The truth is a little less dramatic and a lot more useful.

So instead of chasing trends, we wanted to zoom out and look at what actually matters at each stage of life. We asked Nutrition Scientist and Cymbiotika’s Scientific Affairs Specialist, Naniel Scott, to walk us through it. From building a strong foundation in your 20s and 30s to navigating the very real shifts that happen in your 40s and beyond, her approach is refreshingly grounded in what works in real life not just on paper.

Because if there’s one thing she makes clear, it’s this: your health isn’t shaped by extremes or quick fixes. It’s built quietly, day by day, through the habits you actually stick to. 

What should people in their 20s and 30s focus on nutritionally to build a strong foundation for long term health?

In your twenties, you are building the foundation for long-term health. Across the literature, we see that many negative health markers begin to emerge between ages 30–49, making this decade a critical window for prevention. Since I don’t know each of you individually, I’ll focus on baseline recommendations, take what applies to you.

According to the Dietary Guidelines for Americans 2020–2025, most men and women are not consuming enough fruits, vegetables, whole grains, or dairy. Developing the habit of consistently incorporating these foods into your diet is key. Long-term health isn’t shaped by short-term extremes like cutting out rice or eating salads for a week won’t change your trajectory. It’s the small, daily practices that compound over time. I generally don’t recommend making drastic dietary changes unless medically necessary. Instead, focus on what you can add rather than what you need to remove. There are two reasons for this:

1. Removing foods without a plan for replacement can lead to unintended calorie and nutrient deficiencies

2. If a change is too restrictive or unfamiliar, it’s unlikely to be sustainable

Start by finding simple ways to add fruits and vegetables to your current routine. Once that becomes second nature, you can begin to replace less nutrient-dense foods with more supportive options.

I also recommend prioritizing adequate fiber intake. We are seeing rising rates of colorectal cancer in younger populations not to alarm you, but to highlight the importance of proactive habits. Current dietary patterns show high intake of refined grains (typically low in fiber) and low intake of plant-based proteins, which are often good sources of fiber.

Lastly, for women of menstruating age, it’s important to ensure sufficient intake of iron and vitamin C (is needed for iron absorption)  to help replenish what is lost during the menstrual cycle.

Many people in their 20s and 30s are dealing with stress, irregular schedules, and inconsistent eating habits. How can nutrition help support energy, mood, and hormonal balance during this stage?

The honest answer might not be what you want to hear.

There isn’t a specific diet or single food that will “fix” stress, regulate mood, or balance hormones in isolation. In many cases, it’s actually the opposite where stress, poor sleep, and irregular routines are what begin to disrupt eating habits and, over time, influence how you feel.

It’s easy to want something tangible to control, to think, if I just fix my diet, everything else will fall into place. But that can create unnecessary pressure and self-blame. So consider this your permission to step away from that expectation. Instead, take a step back and focus on the lifestyle factors you can control. Nutrition plays a supportive role, but it works best alongside consistent routines, sleep, and stress management.

That said, during periods of high stress or irregular schedules, the goal of nutrition shifts from optimization to consistency and nourishment:

1. Plan ahead when possible. If your schedule is unpredictable, having meals or snacks ready can prevent long gaps without eating or reactive choices driven by stress.

2. Prioritize balanced meals. Aim for a mix of protein, carbohydrates, fats, and micronutrients to support steady energy and mood.

3. Choose foods you actually enjoy. Food should feel supportive not like another stressor.

4. Keep it realistic. Convenience options (including frozen meals) are absolutely valid, just pair them with something like vegetables if they’re lacking.

When it comes to hormones, it’s also important to recognize that “hormonal imbalance” is often used broadly, without clear definition. Without knowing what specifically is dysregulated, there isn’t a targeted nutritional fix.

Many people begin to notice metabolic shifts in their 40s. What is actually happening in the body during this decade?

Many people start to notice changes in their 40s and immediately assume their metabolism is “slowing down.” The reality is a bit more nuanced.

What’s often happening isn’t a dramatic drop in metabolism, but a combination of gradual physiological shifts and lifestyle patterns catching up. From a physiological standpoint, we see changes in body composition, a gradual decline in lean muscle mass and a relative increase in fat mass. Hormonal changes also begin to play a role. For women, the transition toward perimenopause brings fluctuations in estrogen, while men may experience gradual declines in testosterone. These shifts can influence fat distribution, energy levels, and how the body processes carbohydrates and fats. We also see changes in insulin sensitivity, meaning the body may not handle glucose as efficiently as it once did. This can contribute to increased fat storage, particularly around the abdomen.

That said, a large part of what people experience in their 40s is driven by lifestyle factors such as less daily movement, inconsistent exercise, higher stress, and poorer sleep. These all directly impact energy balance, recovery, and overall metabolic health. So while there are real biological changes occurring, they are relatively gradual. The more noticeable shifts tend to come from the interaction between those changes and long-standing habits. In other words, it’s not that your metabolism suddenly breaks in your 40s, it's that small physiological changes combined with accumulated lifestyle patterns start to become more apparent.

For men specifically, this is also a decade where risk for prostate cancer begins to increase. While nutrition isn’t a guarantee of prevention, there is evidence suggesting that diets rich in lycopene found in foods like tomatoes, watermelon, and cooked tomato products may support prostate health. Incorporating these foods regularly can be a simple, supportive strategy.

How should nutrition change to support hormone balance as the body moves closer to perimenopause? During perimenopause and menopause, what are the biggest nutritional shifts women should be aware of?

Perimenopause can begin as early as the mid-30s and marks the transition toward the end of reproductive function. During this time, the ovaries begin producing hormones more irregularly, estrogen levels fluctuate and gradually decline, and ovulation becomes less consistent. These hormonal shifts drive a number of physiological changes.

One of the most significant is the impact on bone health. Estrogen plays a key role in supporting calcium absorption and bone remodeling. As levels decline, bone breakdown can outpace bone formation, increasing the risk of osteoporosis and fractures. On average, women lose about 1% of their bone mineral density per year after menopause. For this reason, it’s important to aim for around 1,200 mg of calcium daily from foods such as milk, yogurt, and cheese, as well as non-dairy sources like kale, broccoli, Chinese cabbage, and canned sardines or salmon with bones.

Declining estrogen also affects lipid metabolism, often leading to dyslipidemia characterized by increases in LDL cholesterol and decreases in HDL cholesterol. These changes can elevate the risk of cardiovascular disease and are often accompanied by shifts in body composition, including increased fat mass. Nutritionally, the focus during this phase should be on supporting heart health. Prioritize fats that help improve lipid profiles, particularly monounsaturated and polyunsaturated fats. Omega-3 fatty acids found in foods like salmon, mackerel, herring, anchovies, oysters, flaxseed (ideally ground), chia seeds, and walnuts are especially beneficial. Other supportive options include extra virgin olive oil, soy foods, pumpkin seeds, almonds, and pistachios (keeping portion sizes in mind if energy intake is a concern).

Additionally, fiber plays an important role in cholesterol management by helping bind cholesterol in the digestive tract and promoting its excretion. Incorporating fiber-rich foods such as raspberries, pears, apples, and other plant foods can further support cardiovascular and metabolic health during this transition.

When you zoom out and look at nutrition through a life stage lens, what do you wish more people understood about caring for their bodies as they age?

Nutrition is only one piece of the puzzle. Focusing solely on diet while overlooking factors like sleep, movement, emotional support, access to healthcare, and time to invest in yourself and your community is like putting a bandage over something much bigger.

This isn’t a call to be a wellness guru and  have everything “perfectly” balanced. It’s a reminder that your health is shaped by multiple, interconnected factors. The goal is to become aware of them and start identifying small, realistic ways to support each area alongside maintaining a balanced, nourishing diet.