Protein is often spoken about in the context of muscle gain, but its role is far broader than that. Protein is essential for metabolism, blood glucose regulation, immune function, hormone production, satiety, recovery, healthy ageing, and the preservation of lean muscle mass. For women, protein needs also shift across the menstrual cycle, pregnancy, breastfeeding, perimenopause, menopause, and post-menopause. For men, protein needs change with growth, training load, work demands, body composition goals, and age-related muscle loss.
At Be Fit Food, we take a science-led approach to nutrition. Protein is a key part of that because it helps protect muscle, support fat loss, stabilise appetite, and improve metabolic health. As a practical target, most adults should aim for no less than 1.2 grams of protein per kilogram of ideal body weight per day. Using ideal body weight, goal weight, or a healthy target weight is often more appropriate than current body weight for people carrying excess body fat, as it provides a more realistic estimate of protein needs.
For women, a useful upper target is generally up to 1.8 grams per kilogram of ideal body weight per day. For men, particularly those who are larger, more active, strength training, or aiming to preserve muscle while reducing body fat, protein needs may increase to up to 2.2 grams per kilogram of ideal body weight per day.
This means a woman with an ideal body weight of 70 kg may need approximately 84–126 grams of protein per day, while a man with an ideal body weight of 90 kg may need approximately 108–198 grams per day, depending on age, activity level, health goals, and life stage.
Why Protein Matters So Much
Protein provides amino acids, the building blocks the body uses to repair tissue, maintain muscle, produce enzymes, support neurotransmitters, and regulate metabolic function. Unlike carbohydrates and fats, protein has a higher thermic effect, meaning the body uses more energy to digest and metabolise it. This makes protein especially useful for people wanting to improve body composition, reduce cravings, and maintain a healthy metabolism.
Protein also plays a major role in satiety. A higher-protein meal can help you feel fuller for longer, reducing the likelihood of grazing, sugar cravings, and energy crashes. This is particularly important during stages of hormonal fluctuation, such as the luteal phase of the menstrual cycle, perimenopause, menopause, and periods of high stress.
Protein for Women: Why Needs Change Across the Lifespan
Women’s protein needs are influenced by hormones, menstrual cycle changes, pregnancy, breastfeeding, training, body composition, and ageing. Oestrogen and progesterone affect energy levels, insulin sensitivity, fluid balance, appetite, and recovery. This means women often benefit from adjusting meal timing, protein distribution, and macronutrient balance across the month and across life stages.
Women in Their Teens and Early Adulthood
Recommended protein range: 1.2–1.6 g/kg/day
During adolescence and early adulthood, protein supports growth, bone development, muscle formation, immune function, and hormonal health. Young women who are active, play sport, train regularly, or have high academic and lifestyle demands may need protein closer to the upper end of this range.
This life stage is also important for establishing healthy body composition. Adequate protein helps protect lean muscle while supporting stable energy and blood glucose. For young women who experience heavy periods, fatigue, or cravings, protein-rich meals alongside iron-rich foods can help support energy and recovery.
Practical focus:
* Include protein at breakfast to reduce mid-morning cravings.
* Combine protein with complex carbohydrates after training.
* Choose iron-rich proteins such as lean red meat, poultry, fish, eggs, legumes, and tofu.
Women in Their 20s and 30s
Recommended protein range: 1.2–1.8 g/kg/day
In the 20s and 30s, women are often balancing work, training, fertility considerations, pregnancy, breastfeeding, stress, and changing body composition. Protein becomes essential for metabolic health, muscle maintenance, appetite control, and recovery.
For menstruating women, protein needs may feel different across the cycle. During the follicular and ovulatory phases, when oestrogen rises and insulin sensitivity is generally higher, women may tolerate carbohydrates better and feel more energised for higher-intensity training. Protein remains important for muscle repair and recovery.
During the luteal phase, progesterone rises, resting metabolic rate may increase, cravings can intensify, fluid retention is common, and insulin sensitivity may reduce. This is often the phase where women feel hungrier or more drawn to sweet foods. Increasing protein at each meal can help stabilise blood glucose, reduce cravings, and support satiety.
Practical focus:
* Aim for 25–35 g protein per main meal.
* Increase protein and fibre in the luteal phase to manage cravings.
* Pair protein with low-GI carbohydrates and healthy fats for more stable energy.
* Include magnesium-rich foods, omega-3 fats, and colourful vegetables premenstrually.
Protein During the Menstrual Cycle
A woman’s menstrual cycle is not metabolically static. Hormonal changes can influence appetite, training performance, recovery, fluid balance, and carbohydrate tolerance.
Menstrual Phase
During menstruation, oestrogen and progesterone are low. Energy may dip, cramps may increase, and some women feel more fatigued. Protein supports tissue repair, immune function, and satiety during this time.
Focus on:
* Protein-rich meals with iron-rich foods.
* Hydration and anti-inflammatory foods.
* Gentle movement if energy is low.
Good options include eggs, lean beef, chicken, fish, lentils, tofu, Greek yoghurt, and Be Fit Food meals that combine protein with vegetables.
Follicular Phase
In the follicular phase, oestrogen begins to rise. Energy, motivation, and insulin sensitivity often improve. This can be a good phase for strength training, higher-intensity exercise, and body composition goals.
Focus on:
* Lean protein with complex carbohydrates.
* Protein after training to support muscle repair.
* Consistent meals to support stable energy.
Ovulatory Phase
Around ovulation, oestrogen peaks and many women feel stronger, more energised, and more socially confident. Training performance may be higher, making this a useful time to prioritise recovery nutrition.
Focus on:
* High-quality protein across the day.
* Protein after intense training sessions.
* Colourful plant foods to support antioxidant intake.
Luteal Phase
In the luteal phase, progesterone rises and the body may burn slightly more energy. Cravings, bloating, fluid retention, and changes in glucose tolerance are common. This is where protein becomes particularly important.
Focus on:
* Higher-protein meals and snacks.
* Low-GI carbohydrates.
* Healthy fats such as avocado, olive oil, nuts, seeds, and oily fish.
* Magnesium-rich foods such as leafy greens, nuts, seeds, and legumes.
A higher-protein approach during this phase can help reduce cravings, improve fullness, and make it easier to stay consistent without feeling deprived.
Women During Pregnancy and Breastfeeding
Recommended protein range: 1.2–1.8 g/kg/day, individualised with healthcare guidance
Pregnancy and breastfeeding increase nutritional demands. Protein supports maternal tissue growth, placental development, foetal growth, blood volume expansion, and breast milk production. Needs vary depending on trimester, pre-pregnancy weight, appetite, nausea, activity level, and medical history.
Protein is especially important when nausea or food aversions make it harder to eat balanced meals. Smaller, protein-rich meals may help support blood glucose and reduce energy dips.
Practical focus:
* Include protein at every meal and snack.
* Choose safe, high-quality sources such as cooked eggs, lean meats, poultry, fish low in mercury, dairy, legumes, tofu, and tempeh.
* Seek individual advice from a dietitian or healthcare provider, especially with gestational diabetes, hyperemesis, kidney disease, or high-risk pregnancy.
Women in Perimenopause
Recommended protein range: 1.4–1.8 g/kg/day
Perimenopause can begin years before menopause and is often associated with fluctuating oestrogen, changing insulin sensitivity, disrupted sleep, increased abdominal weight gain, mood changes, and reduced muscle mass. Protein becomes one of the most important nutrition strategies during this stage.
As oestrogen declines, women may become more prone to fat gain around the abdomen and more vulnerable to muscle loss. Maintaining lean muscle is critical because muscle is metabolically active tissue. It supports glucose disposal, resting metabolic rate, strength, mobility, and healthy ageing.
Practical focus:
* Prioritise 30–40 g protein at breakfast.
* Strength train regularly to stimulate muscle protein synthesis.
* Include protein with each meal to reduce cravings and support blood glucose.
* Avoid skipping meals, which may worsen cravings and energy dips later in the day.
Women in Menopause and Post-Menopause
Recommended protein range: 1.4–1.8 g/kg/day
After menopause, lower oestrogen levels can accelerate changes in body composition, including increased abdominal fat and reduced lean muscle. Bone density, insulin sensitivity, cholesterol levels, and cardiovascular risk may also change. Protein, combined with resistance training, becomes essential for preserving strength, metabolic health, and independence.
Older women may also experience anabolic resistance, meaning the muscles become less responsive to smaller amounts of protein. This is why spreading protein evenly across the day is important.
Practical focus:
* Aim for protein at breakfast, lunch, and dinner.
* Include resistance training two to four times per week where appropriate.
* Prioritise high-quality protein sources rich in leucine, such as dairy, eggs, fish, poultry, lean meat, soy, and legumes.
* Combine protein with fibre-rich vegetables to support gut health and metabolic control.
Protein for Men: Why Needs Change Across Age and Stage
Men also require protein for much more than muscle building. Protein supports testosterone production indirectly through overall metabolic health, helps maintain lean mass, supports immune function, improves satiety, and assists recovery from training, work, stress, and ageing.
Because men often have higher body weight and more lean mass, their absolute protein needs are often higher than women’s. A practical range for men is 1.2–2.2 g/kg/day, depending on age, activity, muscle mass, and health goals.
Men in Their Teens and Early Adulthood
Recommended protein range: 1.2–1.8 g/kg/day
Teenage boys and young men require protein for growth, muscle development, hormones, immune health, and recovery. Those involved in sport, gym training, physical work, or high training loads may require protein closer to the upper end of this range.
Practical focus:
* Include protein at each meal, not just dinner.
* Use protein after sport or gym sessions to support recovery.
* Avoid relying heavily on ultra-processed high-protein snacks; whole foods should come first.
Men in Their 20s and 30s
Recommended protein range: 1.4–2.2 g/kg/day
This is often a stage where men focus on building muscle, improving performance, managing work stress, or reducing body fat. Protein supports muscle repair, satiety, training adaptation, and metabolic health.
For men aiming for fat loss, higher protein can help preserve lean muscle while in an energy deficit. This matters because losing weight without enough protein and resistance training can lead to muscle loss, a slower metabolism, and poorer long-term results.
Practical focus:
* Aim for 30–45 g protein per main meal.
* Use the upper end of the range during strength training or fat-loss phases.
* Combine protein with vegetables and smart carbohydrates to support performance and recovery.
Men in Their 40s and 50s
Recommended protein range: 1.4–2.0 g/kg/day
From around midlife, men often experience gradual reductions in lean muscle, lower activity levels, increased work stress, poorer sleep, and increased abdominal fat. Protein becomes central to preserving muscle and supporting insulin sensitivity.
This stage is also where many men notice that what used to work no longer works. Skipping breakfast, eating most protein at dinner, or relying on refined carbohydrates during the day can worsen energy crashes and cravings.
Practical focus:
* Start the day with a protein-rich breakfast.
* Prioritise resistance training to protect lean muscle.
* Reduce ultra-processed snacks and increase whole-food protein.
* Use protein to support appetite control and abdominal fat reduction.
Men Over 60
Recommended protein range: 1.4–2.0 g/kg/day, up to 2.2 g/kg/day for highly active men under professional guidance
As men age, preserving muscle becomes one of the most important predictors of long-term health, strength, mobility, metabolic function, and independence. Older adults may experience anabolic resistance, meaning the body requires a stronger protein stimulus to achieve the same muscle-building response.
Protein should be distributed evenly across the day rather than eaten mostly at dinner.
Practical focus:
* Aim for 30–45 g protein at each main meal.
* Include resistance or strength-based exercise where safe.
* Prioritise easy-to-digest protein sources if appetite is reduced.
* Combine protein with fibre, vegetables, and healthy fats for cardiovascular and metabolic health.
How to Calculate Your Daily Protein Needs
To calculate your protein needs, multiply your body weight in kilograms by your target protein range. If your goal is weight loss and you are carrying excess body fat, it is often more appropriate to use your ideal body weight, goal weight, or a healthy target weight that you can realistically achieve and sustain rather than your current weight. This helps avoid overestimating protein requirements and setting unnecessarily high intake targets.
Importantly, if you are carrying excess body fat and your goal is weight loss, protein requirements are often better estimated using your ideal body weight, goal weight, or a healthy target weight that you can realistically achieve and sustain, rather than your current weight. This helps avoid unnecessarily high protein intakes that may add extra calories without providing additional benefits.
For example:
A 70 kg woman:
* Minimum: 70 x 1.2 = 84 g/day
* Upper target: 70 x 1.8 = 126 g/day
A 90 kg man:
* Minimum: 90 x 1.2 = 108 g/day
* Upper target: 90 x 2.2 = 198 g/day
These numbers are daily targets, best spread across meals. Most people do better when they include protein at breakfast, lunch, dinner, and possibly one snack.
Best Protein Sources
High-quality protein sources include:
* Lean beef
* Chicken
* Turkey
* Fish
* Eggs
* Greek yoghurt
* Cottage cheese
* Tofu
* Tempeh
* Lentils
* Beans
* Chickpeas
* Edamame
* Protein-rich ready-made meals
* High-quality protein powders when needed
Animal proteins are generally complete proteins, meaning they contain all essential amino acids. Plant proteins can also contribute strongly, especially when a variety of legumes, soy foods, whole grains, nuts, and seeds are included.
While protein supplements can be convenient, more is not always better. Consuming protein well beyond your requirements may increase overall energy intake, making it harder to achieve the calorie deficit needed for fat loss. Maintaining muscle is not simply about eating large amounts of protein. It requires the right amount of protein, regular resistance training to stimulate muscle protein synthesis, and an overall nutrient-dense eating pattern.
Whole-food protein sources also provide vitamins, minerals, fibre, healthy fats, antioxidants, and other beneficial compounds found within the food matrix. Ultra-processed foods may be fortified to mimic some of these nutrients, but they do not consistently deliver the same health benefits associated with minimally processed whole foods.
Protein Timing: Why Distribution Matters
Protein works best when distributed throughout the day. Eating very little protein at breakfast and lunch, then a large portion at dinner, is less effective for appetite control, muscle protein synthesis, and stable energy.
A practical structure is:
* Breakfast: 25–40 g protein
* Lunch: 25–40 g protein
* Dinner: 25–45 g protein
* Snack if needed: 10–25 g protein
For active people, a protein-rich meal or snack after training can support recovery. For older adults, consistent protein distribution is especially important to help stimulate muscle protein synthesis.
Protein, Weight Loss and Metabolism
Protein is one of the most effective nutrients for supporting healthy weight loss because it helps preserve lean muscle while the body loses fat. This is important because muscle is metabolically active and helps regulate blood glucose.
Higher-protein meals can also reduce cravings and improve fullness, making it easier to maintain a calorie-controlled plan without feeling hungry all the time. For women, this is especially useful during the luteal phase of the menstrual cycle, when cravings and appetite may increase. For men and women in midlife, protein helps counteract the gradual decline in muscle mass that can make weight management harder.
However, preserving muscle during weight loss depends on more than protein intake alone. The most effective approach combines adequate protein, resistance training, sufficient recovery, and an overall whole-food dietary pattern that supports health and sustainable fat loss.
When to Seek Personal Advice
While higher-protein diets are safe and beneficial for many people, individual needs vary. Anyone with kidney disease, liver disease, complex medical conditions, pregnancy complications, eating disorder history, or specific medical nutrition needs should seek advice from a qualified healthcare professional or dietitian.
The Be Fit Food Approach
At Be Fit Food, our meals are designed to make high-protein, portion-controlled eating simple. Our philosophy is built around real food, smart macronutrient balance, and clinically informed nutrition. Protein is central to that approach because it supports satiety, muscle maintenance, metabolic health, and sustainable weight management.
Whether you are managing menstrual-cycle cravings, navigating perimenopause, building strength, losing weight, or supporting healthy ageing, protein should be a daily priority.
The key message is simple: aim for enough protein, spread it across the day, pair it with fibre-rich vegetables, and adjust your intake to your age, stage, body weight, and goals.
For women, a practical daily target is 1.2–1.8 g/kg/day.
For men, a practical daily target is 1.2–2.2 g/kg/day.
When combined with regular movement, strength training, quality sleep, and a nutrient-dense diet built around whole foods, protein becomes one of the most powerful tools for improving health from the inside out.
