Protein is having a moment.
It’s in coffee, bars, powders, cereals, chips, yogurt, pasta, and every “healthy aging” conversation online. Suddenly, everyone is talking about hitting 100 grams of protein a day. BLEH!
But here is the part most people are missing: protein is not automatically good just because it is protein. The type of protein you choose matters. Your metabolism matters. Your kidney function, liver function, cholesterol pattern, blood sugar, digestion, hormone status, and ability to process fats all matter.
Protein is essential, but the “right” protein strategy is not the same for everyone.
Why Protein Matters So Much
Protein is made from amino acids, which are the building blocks your body uses to repair tissue, support immune function, produce enzymes, maintain muscle, support skin structure, and create important brain chemicals. Amino acids are also needed for compounds like creatine, peptide hormones, and neurotransmitters, which is one reason protein is not just a “muscle food.” It is a full-body communication and repair nutrient.
This is especially important after 40 because muscle loss accelerates with age, hormone changes affect body composition, and many people become more insulin resistant. When muscle declines, metabolism becomes less flexible. You may gain weight more easily, lose strength, feel softer in your body, have more blood sugar swings, and struggle to maintain energy.
Muscle is not just for looking toned. Muscle is a metabolic organ. It stores glucose, burns fuel, supports posture, protects joints, helps regulate blood sugar, and helps preserve independence as we age. Research suggests that eating roughly 25–30 grams of protein per meal can help stimulate muscle protein synthesis, especially in older adults.
Why the Brain Needs Protein Too
The brain does not run on protein the same way it runs on glucose or ketones for energy, but it absolutely depends on amino acids. Amino acids help create neurotransmitters involved in mood, motivation, attention, sleep, and stress response.
That matters because many women over 40 are not just trying to lose weight. They are trying to get their energy, focus, emotional steadiness, sleep, hormones, and confidence back. A low-protein breakfast followed by coffee and stress can set the stage for cravings, unstable blood sugar, poor concentration, and afternoon crashes.
This is why I often recommend that clients start by asking: Am I getting enough protein early enough in the day?
How Muscle Uses Protein, Glucose, and Fat
Your muscles are metabolically flexible when they are healthy. They can use glucose, stored glycogen, and fatty acids for energy depending on your activity level, meal timing, and insulin sensitivity. During higher-intensity activity, muscles rely more heavily on glucose and glycogen. During lower-intensity activity and rest, fatty acids become a more important fuel source.
Protein is different. Protein is not your body’s preferred fuel source. Its primary job is repair, structure, signaling, immune support, and rebuilding. However, when calories are too low, carbohydrates are chronically restricted, or the body is under stress, amino acids can be used to help make glucose. That may sound useful, but it can also mean you are breaking down muscle tissue when your body should be preserving it.
The goal is not to eat only protein. The goal is to build a metabolism that can use protein for repair, carbohydrates for strategic energy, and fats for stable fuel.
Red Meat: Nutrient-Dense, But Not Automatically Right for Everyone
Red meat is one of the most nutrient-dense protein sources. Beef, lamb, goat, and game meats contain complete protein along with highly absorbable heme iron, zinc, vitamin B12, selenium, carnitine, creatine, and CoQ10. Red meat, poultry, and fish are among the richer dietary sources of CoQ10, a nutrient involved in mitochondrial energy production.
Beef is often considered the classic high-protein red meat. It is rich in B12, zinc, iron, creatine, and carnitine. For someone with low ferritin, low B12, fatigue, low muscle mass, or high physical demand, beef can be very supportive. But for someone with poor lipid metabolism, elevated ApoB, high LDL particle number, insulin resistance, fatty liver tendencies, or inflammation, the cut and frequency matter. Ribeye and fatty ground beef are not metabolically the same as lean sirloin or grass-fed ground beef.
Lamb is also nutrient-dense and often richer in flavor and fat. It provides B12, zinc, iron, and quality protein. Lamb may be a good option for variety, but because it can be higher in saturated fat depending on the cut, it may not be ideal as a daily protein for someone whose cholesterol markers are already trending in the wrong direction.
Goat is underused in the American diet, but it can be a strong option. It is generally leaner than many cuts of beef and lamb, while still providing red-meat minerals like iron and zinc. For clients who tolerate red meat but need a leaner option, goat can be worth considering.
Venison is one of the most impressive game meats. It tends to be lean, high in protein, and mineral-rich. Compared with fattier red meats, venison may be a better fit for people who want the nutrient density of red meat without as much saturated fat. Game meats can be especially useful for people who want variety, higher mineral density, and a less processed protein option.
So which red meat is superior? It depends on the goal. For iron and B12 restoration, beef and venison can be excellent. For lean mineral-dense protein, venison and goat are often very strong choices. For flavor, satiety, and nutrient density, lamb can be wonderful, but it may not be the best daily choice for someone with poor fat clearance or elevated cholesterol markers.
Chicken: Lean, Familiar, and Easy to Use
Chicken is popular for a reason. It is lean, easy to cook, widely available, and adaptable. Chicken breast is one of the easiest ways to increase protein without dramatically increasing fat intake. This can be useful for people working on body composition, insulin resistance, or weight loss.
Chicken thighs provide more flavor and more fat than chicken breast. That is not necessarily bad, but the choice depends on the person’s metabolism. Someone who is very active and metabolically healthy may do well with thighs. Someone trying to lower cholesterol, improve fatty liver markers, or reduce overall saturated fat intake may do better emphasizing chicken breast, turkey, fish, legumes, or seafood.
Chicken also provides B vitamins, selenium, phosphorus, and some CoQ10, though red meat and organ meats tend to be more concentrated sources of certain nutrients.
Fish and Seafood: The Protein Category Most People Underuse
Fish and seafood are powerful because they offer high-quality protein plus nutrients that are not as available in many land-animal proteins. Fatty fish like salmon, sardines, trout, herring, and mackerel provide omega-3 fatty acids, which support cardiovascular health, inflammation balance, and brain health. The FDA recommends choosing a variety of fish lower in mercury, and many types of fish are both nutritious and lower in mercury.
Seafood also brings iodine, selenium, zinc, B12, taurine, and in some cases vitamin D. Shellfish can be especially mineral-rich. Oysters, mussels, clams, shrimp, crab, and scallops are very different nutritionally, but as a category, seafood can be one of the most metabolically useful proteins.
For many midlife clients, fish is often the “missing protein.” They eat chicken, some beef, maybe eggs, but not enough omega-3-rich seafood. For people with inflammation, brain fog, dry skin, cardiovascular risk, or poor lipid metabolism, seafood deserves more attention.
The caution is mercury. Large predatory fish like swordfish, king mackerel, bigeye tuna, and shark are higher-mercury choices and should be limited or avoided, especially for pregnancy, fertility, and children. Lower-mercury fish like salmon, sardines, anchovies, trout, and many shellfish are often better routine options.
Tofu, Beans, and Plant Proteins: The Underrated Metabolic Advantage
Plant proteins are often dismissed because they may not have the same amino acid density as animal proteins. But that is only part of the story.
Beans, lentils, chickpeas, peas, edamame, tempeh, tofu, and other plant proteins offer something animal proteins do not: protein plus fiber plus carbohydrates in a natural package. That combination can be extremely helpful for gut health, cholesterol clearance, blood sugar regulation, and satiety.
Legumes are especially valuable because they provide protein, slow-digesting carbohydrates, minerals, and fiber. Research reviews describe legumes as strong dietary options because they contain protein, carbohydrates, energy, vitamins, minerals, and fiber together.
Soy-based proteins, including tofu, tempeh, and edamame, are also unique because soy is a complete plant protein. That means it contains all essential amino acids in meaningful amounts.
This is where plant proteins may be superior for certain people. If someone has constipation, high cholesterol, sluggish estrogen clearance, gut microbiome imbalance, or insulin resistance, adding beans or lentils may do more metabolically than simply adding another serving of chicken.
The downside is tolerance. Some people with IBS, SIBO tendencies, bloating, or histamine issues may not tolerate legumes well at first. In those cases, the solution is not always avoidance forever. It may be portion size, preparation method, digestive support, gut treatment, or choosing easier options like tofu, tempeh, or well-cooked lentils.
Protein Powders: Helpful Tool or Hidden Problem?
Protein powders can be incredibly useful. They are convenient, portable, and can help people reach their protein goals when appetite, time, or meal prep is a challenge. Whey protein is a complete protein and is typically rich in leucine, the amino acid most associated with triggering muscle protein synthesis. Plant protein powders can also be useful, especially when they combine sources like pea, rice, hemp, pumpkin, or soy to improve the amino acid profile.
But protein powders are not automatically equivalent to food.
Whole foods bring protein plus minerals, fatty acids, vitamins, fiber, and other nutrients. Protein powder brings concentrated protein, but often without the same nutrient complexity. It can support a goal, but it should not replace a well-built diet.
There are also quality concerns. Protein powders may contain contaminants such as lead, arsenic, cadmium, mercury, BPA, or pesticide residues depending on sourcing and manufacturing. Consumer Reports recently advised against daily use for many protein powders because of heavy metal concerns, and Clean Label Project testing has reported contamination concerns in a significant percentage of products tested.
Plant-based powders can be more likely to accumulate certain heavy metals because plants pull minerals from soil. That does not mean all plant powders are bad. It means quality testing matters. Look for brands that provide third-party testing, heavy metal screening, and ideally NSF, Informed Choice, USP, or comparable quality verification.
Also, collagen powder is not a complete protein. It can support skin, joints, connective tissue, and gut lining in some contexts, but it should not be counted as your main muscle-building protein because it lacks enough of certain essential amino acids.
When Is the Best Time to Eat Protein?
For most people, protein works better when it is distributed throughout the day instead of saved for dinner. The common pattern is coffee for breakfast, salad or snack for lunch, then a large dinner. That pattern often leaves the body undernourished during the most active part of the day.
A better strategy for many adults is to aim for protein at breakfast, lunch, and dinner. For muscle maintenance and healthy aging, many people do well with approximately 25–35 grams per meal, adjusted for body size, goals, and kidney function. Research in older adults supports the idea that protein distribution across meals, with enough leucine-rich protein at each meal, may better support muscle protein synthesis.
Breakfast is especially important for women over 40 because cortisol, blood sugar, insulin, and appetite signaling can all be more reactive in midlife. Starting the day with protein can reduce cravings, improve satiety, and help stabilize energy.
After resistance training is also a smart time to consume protein. You do not need to obsess over a tiny “feeding window,” but you do want enough protein within the hours after lifting to support repair.
Does Food Order Matter?
Yes, for many people it does.
Eating protein and vegetables before concentrated carbohydrates can reduce post-meal glucose and insulin spikes. Studies in people with prediabetes and type 2 diabetes have found that eating protein and vegetables before carbohydrates improves post-meal glucose patterns compared with eating carbohydrates first.
That does not mean everyone needs to eat in a rigid order forever. But if you have insulin resistance, cravings, afternoon crashes, belly fat gain, PCOS tendencies, perimenopausal weight gain, or elevated fasting glucose, food order can be a simple and powerful tool.
A practical version looks like this: eat vegetables first, then protein and healthy fats, then starch or fruit last. This slows the glucose rise and often improves satiety.
Can You Eat Too Much Protein?
Yes! More is not always better.
For healthy people with normal kidney function, higher-protein diets can be appropriate, especially for muscle building, weight loss, and aging. But very high protein intake may be problematic for people with reduced kidney function, kidney disease, elevated BUN, elevated creatinine, reduced eGFR, dehydration, or a history of kidney stones. I’ve seen this first hand with multiple clients. High protein intake can increase kidney workload and may worsen kidney function in people with existing kidney disease.
Protein intake can also affect lab interpretation. Higher protein intake, higher muscle mass, creatine use, dehydration, and intense exercise can all influence creatinine. That means someone may see creatinine rise or eGFR fall and not understand whether this reflects true kidney dysfunction, hydration status, muscle mass, or supplement use.
The liver and cholesterol conversation is more nuanced. Protein itself does not automatically cause fatty liver. But a high-protein diet built around fatty meats, processed meats, excess calories, low fiber, alcohol, poor sleep, and insulin resistance can absolutely worsen metabolic health. Some people will see LDL cholesterol, ApoB, triglycerides, liver enzymes, or fatty liver patterns worsen depending on the type of protein they choose and how well they process fats.
This is why “eat more protein” is incomplete advice.
The better question is: Which protein matches your physiology?
Why Testing Matters Before Following the High-Protein Trend
Most people do not know if they have poor lipid metabolism. They do not know if they are clearing fats well, if their liver enzymes are trending up, if their kidney markers are stable, if their fasting insulin is elevated, or if their cholesterol particles are inflammatory.
This matters because two people can eat the same high-protein diet and have completely different outcomes.
One person may lose fat, gain muscle, stabilize blood sugar, and feel amazing.
Another person may see constipation, elevated LDL, increased ApoB, higher liver enzymes, kidney stress, fatigue, or worse digestion.
The difference is not willpower. It is physiology.
Before dramatically increasing protein, especially from red meat, powders, or high-fat animal sources, it is CRITICAL to check markers like fasting insulin, glucose, A1c, lipids, ApoB, triglycerides, liver enzymes, kidney function, BUN, creatinine, eGFR, inflammatory markers, ferritin, B12, vitamin D, thyroid markers, and sometimes uric acid.
At Potentia, this is where functional medicine becomes so valuable. We are not just asking, “Are you eating enough protein?” We are asking, “Can your body use this protein well, clear the fats that come with it, maintain kidney safety, preserve muscle, and improve metabolism?”
How Much Protein Do You Actually Need?
Let’s calculate this in pounds ( not kg)
The general minimum recommended intake for adults is about 0.36 grams of protein per pound of body weight per day. That is the baseline amount to prevent deficiency for many adults, not necessarily the optimal amount for muscle, aging, weight loss, or metabolic repair.
For many adults over 40, a more practical target is often:
0.55 to 0.75 grams per pound of body weight per day for general health, body composition, and aging support.
For people actively strength training, losing weight, recovering from injury, or trying to preserve muscle, the range may be closer to:
0.70 to 1.0 gram per pound of goal body weight per day, assuming kidney function is healthy and labs are monitored.
So if someone weighs 160 pounds, a reasonable range may be about 88 to 120 grams per day, depending on their goals and lab markers.
If someone weighs 200 pounds but their goal weight is 160 pounds, I often prefer calculating from goal weight or lean body mass rather than automatically pushing them to 200 grams per day. More is not always better.
A simple starting formula is:
Goal body weight in pounds x 0.6 = daily protein target
For a 150-pound goal weight, that equals about 90 grams of protein per day.
Then you personalize from there based on strength training, digestion, kidney function, liver markers, lipids, blood sugar, appetite, and body composition.
The Bottom Line
Protein is important. It supports muscle, metabolism, brain function, repair, immune health, skin structure, satiety, and healthy aging. But the high-protein trend has made protein sound like a magic solution.
It is not magic. It is a tool.
The right protein plan should help you build muscle, stabilize blood sugar, improve energy, support hormones, and protect long-term metabolic health. But if you choose the wrong type of protein for your physiology, you may drive up cholesterol, worsen digestive symptoms, stress kidney clearance, elevate creatinine, lower eGFR, or aggravate liver and fat metabolism patterns.
The best protein is NOT the one trending online.
The best protein is the one your body can digest, absorb, metabolize, and use.
If you are increasing protein and want to know whether your body is responding well, we can help you test your levels, evaluate your fat metabolism, review your kidney and liver markers, and create a protein strategy that fits your goals.
Schedule a consultation with our team of experts at Potentia MedSpa in Lafayette, California, or call us at 510 230 2282. We are the only Functional Aesthetics Medspa in the San Francisco Bay Area, offering a combination of medical expertise, innovative technology, and holistic support to help you improve your metabolism, body composition, skin, and long-term health from the inside out.