PurePlant Protein

By Eugene Capitano, DC MSc (Neuroscience & Psychology of Mental Health)

ACSM-Certified Exercise is Medicine® Practitioner and Personal Trainer

DOWNLOAD THE FULL SCIENTIFIC PDF WITH REFERENCES BELOW

Most people think building muscle is all about eating more protein. But the science tells a more precise story, how much protein you eat per meal matters as much as how much you eat in a day. The key player is a single amino acid called leucine, the switch that turns on your body's muscle-building machinery.

The Leucine Trigger — Your Muscle's "On" Switch

When you eat protein, your digestive system breaks it into amino acids. Leucine signals a molecular pathway known as mTORC1, which tells your muscles, "time to grow." Once enough leucine enters your bloodstream, it crosses a threshold, the point at which muscle-protein synthesis (MPS) is fully activated.

Below this threshold, the signal is too weak to activate muscle protein synthesis (MPS). Once the threshold is met, MPS is maximally stimulated — a concept often called the "muscle-full effect." However, the process isn't as simple as an on/off switch.

Think of it more like a dimmer: when you're young and metabolically responsive, a small amount of leucine can turn the light fully on. But with aging or anabolic resistance, the dimmer becomes less sensitive, you need a stronger signal (more leucine or higher-quality protein) to achieve the same brightness.

The Science — The Leucine Threshold & the Muscle-Full Effect

Research shows that muscle growth depends on hitting a precise per-meal protein target that changes with age.

- Under 39: Around 20–25 grams of high-quality protein (≈ 2 g leucine) is enough to fully activate muscle-protein synthesis (MPS).

- Ages 40–59: You need about 25–30 grams (≈ 2.2–2.5 g leucine) to offset the gradual decline in anabolic sensitivity that begins in midlife.

- 60 and older non active: The target rises to 30–40 grams (≈ 2.8–3.0 g leucine) per meal to overcome age-related anabolic resistance. If active the thresholds would be similar to ages 40-59.

Once that threshold is reached, your muscles enter the "muscle-full" state. Extra protein won't increase growth. The key is not eating more at once, but hitting this threshold repeatedly at separate meals throughout the day.

The Science — The Leucine Threshold & the Muscle-Full Effect

Research shows that muscle growth depends on hitting a precise per-meal protein target that changes with age. Once that threshold is reached, your muscles enter what scientists call the "muscle-full" state—the point at which muscle-protein synthesis (MPS) has been maximally stimulated and protein no longer adds to growth.

- Under 40: Around 20–25 grams of high-quality protein (≈ 2 g leucine) is enough to fully activate MPS. This amount easily comes from a serving of whey protein, eggs, chicken, or fish.

- Ages 40–59: You need about 25–30 grams (≈ 2.2–2.5 g leucine) to offset the gradual decline in anabolic sensitivity that begins in midlife. Evenly distributing this amount across meals produces stronger muscle-building responses than saving most protein for dinner.

- 60 and older: The target rises to 30–40 grams (≈ 2.8–3.0 g leucine) per meal to overcome age-related anabolic resistance. Pairing this with resistance training two to three times a week keeps muscles responsive and maintains strength and metabolic health.

- 75 and frail: At this stage, appetite and chewing ability often decline, so 30–40 grams of high-quality or leucine-enriched protein—often delivered as a whey-based shake—helps preserve mobility and independence. Protein intake should be guided by a healthcare provider if there are kidney or metabolic concerns.

The takeaway: It's not about eating more protein at once. It's about hitting your threshold at each meal, several times a day. Each time you reach this threshold-hitting meal is a new opportunity to turn the muscle-building "switch" back on.

The "More Is Better" Myth

Studies using gold-standard tracer methods show that once the leucine threshold is met, MPS plateaus. For example, 40 g of whey protein doesn't build more muscle than 20 g in young adults at rest. Beyond the threshold, the extra amino acids are diverted to non-muscle uses or oxidized for energy.

The real advantage comes from hitting the threshold at several meals per day, not from overloading one. This rhythm of repeated MPS stimulation drives muscle maintenance, metabolic balance, and healthy aging.

Exercise: The Multiplier

Resistance training dramatically extends your anabolic window — up to 24 hours of enhanced sensitivity. Eating a threshold-hitting protein meal after training amplifies the muscle-building response. For older adults especially, combining strength work with proper protein distribution is the single most powerful strategy to counter sarcopenia.

Your Action Plan

- Under 39: 20–25 g protein per meal; total ≈ 1.0-1.2 g protein / kg body weight / day.

- 40–59: 25–30 g per meal; total ≈ 1.2–1.4 g /kg.

- 60 + active: 25–30 g per meal; total ≈ 1.2–1.6 g /kg.

- 60 + sedentary: 30–40 g per meal; total ≈ 1.4–2.0 g /kg.

- 75 + frail: 30–40 g per meal; total ≈ 1.4–1.8 g /kg. (consider shakes); monitor kidney function.

Each meal is an independent opportunity to trigger MPS — three strong meals beat one massive one every time.

The Bottom Line

Leucine is the spark that ignites muscle growth, but you need the right dose at the right time. Don't spread protein thinly. Don't rely on one big dinner. Rather, eat a balanced, leucine-rich meals throughout the day and pair them with regular resistance exercise.

That's how you preserve muscle, strength, and metabolic vitality — at any age.

By Eugene Capitano, DC MSc (Neuroscience & Psychology of Mental Health)

ACSM-Certified Exercise is Medicine® Practitioner and Personal Trainer

DOWNLOAD THE FULL SCIENTIFIC PDF WITH REFERENCES BELOW

Net Protein Balance: Why Timing Matters for Young Adults

For this article, "young adults" refers to individuals under 39 years of age. In this group, anabolic sensitivity and recovery capacity remain high — yet when you eat protein can still determine whether you grow or merely maintain. What this means is that even for younger individuals hitting the leucine threshold two to three times a day is key for muscle protein synthesis and not just total daily intake.

What Is Net Protein Balance (NPB)?

NPB = MPS − MPB

- MPS (Muscle Protein Synthesis): how quickly new muscle proteins are built.

- MPB (Muscle Protein Breakdown): how quickly existing muscle proteins are degraded.

When MPS > MPB, the balance is positive and muscle growth occurs.

When MPB > MPS, it's negative and muscle is lost.

The goal for lifters under 39 is to keep NPB positive as long and as often as possible—especially around workouts.

The Post-Workout Problem

Resistance exercise activates both MPS and MPB. In a fasted state, breakdown briefly outpaces synthesis, creating a catabolic gap just when your muscles are primed to grow.

- Exercise raises both MPS and MPB, but MPB rises faster.

- NPB turns negative, meaning muscle loss despite training stimulus.

- MPS peaks for only 1–4 hours post-exercise; without amino acids, that signal fades before building new tissue.

The Six-Hour Delay: A Missed Opportunity

If you train and wait six hours to eat:

- You remain catabolic for the entire period.

- The MPS surge subsides before amino acids arrive.

- You lose the prime anabolic window of maximal sensitivity.

- Total daily muscle gain drops, even if total protein intake later is high.

Your muscles do stay responsive for ≈ 24 hours, but the first 3 hours post-exercise are where timing matters most.

The Fix: Protein Immediately After Training

Consuming 20–25 g of high-quality protein (≈ 2 g leucine) immediately after, or shortly before, training achieves three things:

- Stimulates MPS while sensitivity peaks.

- Inhibits MPB, turning NPB positive.

- Starts recovery and muscle accretion sooner.

Studies show that young adults who take protein right after exercise gain more lean mass and strength over 8–12 weeks than those who delay intake.

The Bottom Line

Your muscles remain responsive to protein for about 24 hours after training, but the 0–3 hour window is the most efficient period to switch from catabolic to anabolic. Delaying protein for six hours extends muscle breakdown and reduces total daily accretion.

For adults under 39:

- Consume 20–25 g of high-quality protein within 30 minutes post-workout.

- Spread total protein evenly across meals (≈ 3 triggers per day).

- Choose leucine-rich sources such as TLC PureOrigin™ WPC 80, eggs, or dairy.

Frequently Asked Questions

1. What age is considered "young"?

"Young" refers to adults under 39 years. Muscles in this group still respond maximally to smaller protein doses (≈ 20–25 g per meal).

2. When does anabolic resistance begin?

Typically in the early forties, when muscle becomes less sensitive to amino acids and requires 25–30 g protein per meal to achieve the same effect.

3. Does protein timing matter if I meet my daily target?

Yes. Timing controls efficiency. A post-workout shake shifts NPB positive faster, boosting total daily muscle gain.

4. Why use WPC 80 instead of whey isolate?

TLC's non-instantized WPC 80 provides similar leucine levels but retains prebiotic peptides that improve gut and immune health, supporting the gut–muscle connection for better recovery.

5. How soon should I eat after training?

Aim for within 30 minutes post-workout to capitalize on the anabolic window and speed recovery.

By Eugene Capitano, DC MSc (Neuroscience & Psychology of Mental Health)

ACSM-Certified Exercise is Medicine® Practitioner and Personal Trainer

DOWNLOAD THE FULL SCIENTIFIC PDF WITH REFERENCES BELOW

Net Protein Balance: Why Timing Matters Even More for Older Adults

After 40, the rules of muscle building change. The same workout and protein routine that once built strength effortlessly now produce slower progress. This is due to anabolic resistance, the gradual decline in how effectively your muscles respond to protein and exercise. Understanding and managing your Net Protein Balance (NPB) is key to preserving strength, muscle, and independence as you age.

What Is Net Protein Balance (NPB)?

Net Protein Balance measures the tug-of-war between muscle growth and breakdown. The equation is simple: NPB = MPS − MPB

- MPS (Muscle Protein Synthesis) is the rate at which new muscle tissue forms.

- MPB (Muscle Protein Breakdown) is the rate at which existing tissue is degraded.

When MPS exceeds MPB, you gain muscle; when MPB exceeds MPS, you lose it. For older adults, maintaining a positive NPB is harder because the body becomes less responsive to dietary protein. To offset this, both timing and dosage of protein intake must be optimized.

Why Post-Exercise Protein Timing Matters More After 40

Resistance exercise elevates both MPS and MPB at the same time. In a fasted state, breakdown rises faster than synthesis, leaving you in a catabolic state even after training.

In younger adults, this gap quickly closes once protein is consumed. For adults over 40, however, the MPS response is smaller and slower. Your muscle tissue needs more protein per meal and faster post-workout feeding to flip NPB from negative to positive.

The Six-Hour Delay: A Costly Mistake

If you train and wait six hours before eating, your muscles stay in a catabolic state the entire time. By the time you finally consume protein, the initial MPS surge has subsided. You miss the period of peak exercise-induced sensitivity, which is most pronounced in the first three hours after training.

For older adults, this loss is significant. Your muscles are already less efficient at using amino acids, and every hour of delay compounds that inefficiency, accelerating the gradual loss of lean tissue known as sarcopenia.

Protein Needs by Age

Protein requirements rise with age because the body's ability to use dietary amino acids declines. Here's how to adjust your intake:

- Ages 40 to 59: Aim for 25–30 grams of high-quality protein immediately after training, with a total of 1.2–1.4 grams per kilogram of body weight per day.

- Older adults (≥ 60 yr, active / regular physical activity): Aim for 25–30 grams of high-quality protein immediately after training, and a total of 1.2–1.6 grams per kilogram daily.

- Older adults (≥ 60 yr, sedentary / minimally active and healthy): Target 30–40 grams per meal, with a daily total between 1.4 and 2.0 grams per kilogram to overcome anabolic resistance.

- Disease / Rehabilitation / Severe Catabolism: Target 35–45 grams per meal, with a daily total between 1.5 and 2.0 grams per kilogram to overcome anabolic resistance. Intake over 1.8 g⋅kg−1⋅day−1 requires medical supervision.

Example: If you weigh 80 kilograms and are over 65, aim for 96–128 grams of protein per day, spread across three to four meals of 30–40 grams each to maintain a positive NPB.

The 24-Hour Window Is Real — But Don't Rely on It

Research shows that your muscles remain responsive to protein for up to 24 hours after exercise. However, this does not mean you can delay eating.

- 0–3 hours post-exercise: MPS is maximally elevated — this is your most important feeding window.

- 3–24 hours post-exercise: Muscle remains sensitized, but efficiency declines.

Think of this as a safety net, not an excuse to skip your post-workout shake. Eating promptly maximizes the benefit of your training and keeps you in a growth-ready state.

The Bottom Line

After 40, muscle maintenance depends on precision. Protein timing, quality, and distribution are no longer optional — they are essential for protecting muscle and metabolic health.

- Eat 25–40 grams of protein within 1–2 hours after exercise (depending on age).

- Spread your protein evenly across three to four meals per day.

- Avoid long fasting gaps, especially after training.

For adults 65 and older, these habits slow muscle loss, enhance recovery, and help maintain strength and independence.

Frequently Asked Questions

1. What is anabolic resistance?

Anabolic resistance is the age-related decline in muscle's responsiveness to dietary protein and exercise. It begins around 40 and becomes more pronounced after 65.

2. How much protein do older adults need?

Most adults 40 and over benefit from 1.2–1.6 grams of protein per kilogram of body weight daily, spread across three to four meals.

3. What protein is best for older adults?

Whey Protein Concentrate (WPC 80) provides high leucine content to trigger muscle-protein synthesis through the mTORC1 pathway while preserving gut-supportive compounds.

4. Why non-instantized whey?

TLC PureOrigin™ uses non-instantized WPC 80 to avoid emulsifiers and preserve native bioactives that enhance gut health, nutrient absorption, and overall muscle recovery.

5. Is timing still important if I meet my daily target?

Yes. The first three hours post-workout are the most efficient time to turn a negative NPB into a positive one. Waiting too long reduces the total anabolic effect.