Lesson 2: Protein Power — Protecting Health, Strength & Satiety

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What is protein?

Protein is made of long chains of amino acids—the building blocks your body uses for repair and renewal. There are 20 amino acids total, and 9 are essential (meaning they must come from food).

Think of it like this:

• Amino acids are like letters in the alphabet
• Those letters form words—proteins
• Proteins come together into sentences—tissues, enzymes, and hormones that tell your body's story
• Together, they create the novel—you

During digestion, protein is broken back down into amino acids and used to create new proteins your body needs.

Protein: The building blocks of the body

Protein is the raw material that builds your skin, hair, organs, and bones. Inside your cells, protein becomes enzymes that spark the reactions keeping you alive—from digesting food to signaling cell formation.

How it works:

• Builds and repairs every tissue in the body
• Forms enzymes and hormones that regulate body functions
• Supports immune function and recovery from illness and stress

Protein also influences how you feel: it slows digestion and triggers fullness hormones like GLP-1 and PYY.

Why protein matters now (on GLP-1s)

Muscle is metabolically active—it burns calories even at rest, stabilizes blood sugar, and gives you strength and stamina.

The challenge:

• Risk of inadequate intake due to overall reduction in calories
• Inadequate protein increases muscle loss while in a calorie deficit

The opportunity: With proper nutrition and activity, muscle mass can be spared during weight loss.

The science of muscle maintenance

Your body is always building and breaking down muscle. Protein keeps the balance.

Muscle protein synthesis (building)

• Eating protein provides amino acids—your body's building blocks
• These amino acids rebuild and repair muscle
• A steady supply keeps your amino acid pool stocked for building

Muscle protein breakdown

• When amino acid levels drop, the body breaks down muscle for fuel
• Illness, stress, and under-eating accelerate this breakdown
• Without enough dietary protein, you "borrow bricks" from your own wall

Bottom line: Regular protein intake keeps your body building instead of breaking down.

Protein and satiety

Protein is one of the most satisfying macronutrients. Here's why:

• Boosts GLP-1 and PYY (fullness signals)
• Stabilizes blood sugar and energy
• Reduces late-day cravings

Science highlight: Protein has a high thermic effect of food (TEF)—about 20-30% of its calories are used just to digest and absorb it. This means your body works harder to process protein, which can support metabolism.

Protein and metabolism

Why this matters:

• Muscle burns calories, even at rest
• More muscle = easier weight maintenance
• Protein intake protects your metabolism

Target protein intake: 1.2–2.0 g/kg body weight per day

The formula:

• Strength training + quality protein = better muscle preservation
• This is why nutrition isn't optional, it's protective

How much protein do you need?

Your protein needs depend on your activity level and goals. Here's a quick reference:

Note: This may need to be adjusted based on overall calories. I don't recommend exceeding 40% of your calories from protein.

Calculate your protein goal

Step 1: Convert your weight to kilograms

• My weight (lbs) ÷ 2.2 = my weight (kg)

Step 2: Multiply by your target range

• For most people on GLP-1s: multiply by 1.2–1.6
• For those over 50, exercising frequently, or trying to build muscle: multiply by 1.5–2.0

Example: 185 lb woman, age 35, lightly active

• 185 ÷ 2.2 = 84 kg
• 84 × 1.2 = 101 g protein (low end)
• 84 × 1.6 = 134 g protein (high end)
• Target range: 101-134 g/day

How protein works throughout the day

It's not just about eating enough protein—it's about using it consistently to help your body feel balanced and capable from morning to night.

Benefits of spreading protein throughout the day:

• Replenishes amino acid pool for building and repair
• Stabilizes blood sugar and hunger, which reduces cravings
• Supports mood, focus, energy and keeps metabolism active

Aim for at least 25 g of protein at meals to stimulate muscle protein synthesis (MPS) and support ongoing repair.

Practical ways to meet your target

Quick reference: Protein at each meal

Easy protein portions

• 3 oz chicken or fish ≈ 25 g protein (about the size of a deck of cards)
• 1 cup Greek yogurt or cottage cheese ≈ 20-25 g protein
• 1 cup lentils or edamame ≈ 15-18 g protein

For low-appetite days

Choose liquid protein options like:

• Smoothies with protein powder
• Greek yogurt drinks
• Ready-to-drink protein shakes
• Kefir

These are easier to sip and digest when solid foods feel heavy.

Tips for meeting your protein goal

Get protein from a variety of sources:

• Include both animal and plant proteins throughout the week
• Plant proteins (beans, lentils, tofu, tempeh) come with added fiber

On lower-appetite days:

• Prioritize protein first at meals
• Use softer textures that are easier to eat (scrambled eggs, cottage cheese, smoothies)
• Sip protein shakes between meals

Track for 3 days:

• Write down what you eat and estimate protein grams
• Notice patterns: Are you getting protein at every meal? Which meals are lowest?
• Adjust based on what you learn

Your action steps this week

Step 1: Calculate your protein target (1.2–2.0 g/kg body weight)

Step 2: Break it down by meal

• Aim for at least 25 g protein at breakfast, lunch, and dinner
• Add 10-20 g through snacks

Step 3: Track for 3 days

• Note your protein intake at each meal
• How did you feel? More energy? Less hungry between meals?

Weekly goal = skill you practice this week:

• Add a protein-rich food to each meal
• Include a protein snack between meals
• Try one new protein source this week

Minimum habit = simpler version for busy days:

• Add protein at one meal
• Have a protein-based snack
• Prioritize protein at breakfast

Reflection prompts

At the end of the week, reflect on:

• What helped me meet my protein goal?
• How did I feel on days I hit vs. missed my target?
• Was my energy steadier? Did I have fewer cravings?

Key takeaway

Fueling your body well today protects the strength you'll rely on tomorrow.

Next lesson

Lesson 3: Fiber, fluids & fullness

Learn how to support digestion, reduce bloating, and stay hydrated when appetite is low.

Download resources

Lesson 2 Worksheet (PDF): Calculate your protein target, plan protein at each meal, and track your intake for 3 days

50 Easy Ways to Add Protein Guide (PDF): Quick reference for protein-rich foods and simple meal ideas

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This information is for educational purposes and does not replace medical advice.