Fats and Proteins
Protein and quality fat are not just nutrients but hormonal signals: they preserve muscle, smooth the glucose curve, and prevent the muscle loss behind the yo-yo effect.
Protein and quality fat are not merely nutrients—they function as hormonal signaling molecules. Protein provides a strong satiety signal through GLP-1[G], CCK[G], and PYY[G] secretion, preserves muscle mass, and protects insulin sensitivity[G]; quality fat slows gastric emptying and smooths the glucose curve. Weight loss without adequate protein causes muscle loss and metabolic slowdown—this is the main biological cause of the yo-yo effect. The goal is not macronutrient restriction, but the protein + quality fat + fiber combination at every main meal.
Protein: Muscle Protection, Insulin Sensitivity, and Satiety
Muscle is the body’s largest glucose-consuming organ: 80-85% of insulin[G]-mediated glucose uptake occurs in skeletal muscle. If muscle mass decreases—either from inappropriate dieting or physical inactivity—insulin sensitivity[G] declines, basal metabolic rate falls, and weight regain risk increases. Adequate protein intake is the primary tool for preserving muscle mass.
Protein requirement during weight loss: clinical guidelines recommend 1.2–1.6 g protein per kilogram of body weight. For an 80 kg patient, this is 96–128 g daily protein. For reference: 150 g chicken breast ≈ 35 g, 3 eggs ≈ 18 g, 200 g Greek yogurt ≈ 14 g, 100 g lentils ≈ 9 g. The daily target must be distributed across 3-4 meals. The rate of weight loss also matters: if weekly weight loss exceeds 750 g, the risk of muscle loss increases significantly, even with adequate protein intake.
Protein’s satiety effect is hormonally mediated: protein stimulates CCK[G] secretion from I-cells and GLP-1[G] and PYY[G] secretion from L-cells (see Chapter 13, Protein Leverage Hypothesis), and signals to the brain through amino acid-sensing mechanisms that energy balance is stable. A breakfast with 25-30 g protein is one of the most effective tools for reducing hunger levels throughout the day.
Fats: Quality, Inflammation, and Glucose Curve Smoothing
Fats are not enemies—the question is not quantity, but source and processing. Dietary fat slows gastric emptying and the rate at which carbohydrates enter the small intestine (fat-protein first effect), resulting in a flatter glucose peak and prolonged satiety. Quality fat sources therefore directly improve the glucose curve.
Recommended fat sources and practical guide:
- Cold-pressed MUFA[G] (monounsaturated): extra virgin olive oil (1–2 tablespoons/day on salads, medium-heat cooking), avocado (½ piece/day), avocado oil — anti-inflammatory and supportive of insulin sensitivity[G]
- Omega-3[G] (essential, anti-inflammatory): fatty marine fish — salmon, sardines, mackerel, herring 2–3 servings/week (approx. 150 g/serving); plant sources: walnuts 30 g/day, flaxseed 1–2 tablespoons (freshly ground), chia seed, hemp seed
- Coconut fat / MCT: max 1–2 tablespoons/day, stable for high-heat cooking; routine daily large doses not recommended (saturated fat content)
- Animal fat (moderated): pasture-raised animal fat, butter/ghee for cooking in small quantities; contains natural CLA and vitamin K2
- Sources to avoid: industrial hydrogenated vegetable oil (margarine, “partially hydrogenated” oils), routine large-volume use of high omega-6 seed oils (sunflower, corn, soybean oil), industrial trans fat (chips, fried products, industrial pastries), reused frying oil
Industrial trans fats (hydrogenated vegetable oils; their most common forms are elaidic acid and other geometrical isomer trans fatty acids)—found in margarine, cookies, industrial pastries, cheap frying oils—have strong pro-inflammatory effects and impair insulin sensitivity[G]. Important distinction: natural trans fat (CLA, in meat and dairy) is not the same as industrial trans fat, and is not harmful. In packaged product ingredients, “partially hydrogenated vegetable oil” signals industrial trans fat—avoid this.
The Protein–Fat–Fiber Combination and Metabolic Stability
When every main meal contains protein, quality fat, and fiber, the three mechanisms act synergistically: protein acts hormonally, fat mechanically (slowing gastric emptying), and fiber as a fermentable substrate (SCFA[G] production) all contribute to sustained satiety and stable glucose profile.
From a microbiota[G] perspective, macronutrient balance is also important. The anti-inflammatory effect of omega-3 fatty acids extends to the gut barrier [120]; adequate protein intake stabilizes the body’s long-term energy balance through muscle mass preservation. SCFA[G] (butyrate[G], propionate[G]) produced by fermentable fibers support both intestinal epithelial energy supply and gut barrier integrity.
In practice, a simple rule: every main meal should contain protein, quality fat, and fiber. This is not an extreme diet—it is a stable eating pattern that can be maintained long-term.
Three-day goal summary: to understand that adequate protein and fat intake support satiety, muscle mass preservation, and stable glucose profile, and to establish an eating pattern that reduces hunger fluctuation and excessive carbohydrate load.
- Every main meal contains adequate protein (target: 1.2–1.6 g/body weight kg daily)
- Healthy fats incorporated into every meal
- Smaller post-meal fluctuation on CGM[G] curve—if CGM[G] not available: hunger scale 2 hours after as an indicator of post-meal fluctuation
- At least 7900 steps/day
- Hunger scale shows more stable values
- Daily fluid intake target minimum 2.0 liters (morning 2x200ml, daytime minimum 1.2l, evening 2x200ml)
Why does it matter beyond just calories?
- Muscle protection: skeletal muscle accounts for 80-85% of insulin[G]-mediated glucose uptake; muscle loss directly impairs insulin sensitivity[G] and reduces basal metabolic rate
- Hormonal satiety: protein provides strong and sustained fullness through GLP-1[G], CCK[G], and PYY[G] secretion; fat slows gastric emptying and smooths the glucose curve
- Metabolic safety: weight loss >750 g/week carries muscle loss risk; protein-deficient weight loss reduces metabolic rate and increases regain risk
- Industrial vs. natural trans fat: hydrogenated vegetable oil (in margarine, cookies) = harmful; natural CLA (in meat, dairy) = healthy—the two are not the same
How do we achieve stability?
- The protein–fat–fiber “holy trinity”: every main meal contains all three elements—this provides the longest satiety and flattest glucose curve
- Protein priority: breakfast minimum 25–30 g protein; daily target 1.2–1.6 g/body weight kg; see specific examples in main text
- Quality fat sources: omega-3 fish, olive oil, walnuts, avocado—2-3 fish servings weekly; 30 g nuts/seeds daily; see detailed list above
- Fat control: avoid industrial trans fats: skip products containing “partially hydrogenated vegetable oil”
What do we measure?
- Hunger scale values after meals (target: prolonged satiety)
- CGM[G] glucose variability after protein-rich vs. carbohydrate-rich meals (if CGM[G] available)
- Daily protein intake log (target: at least 3 servings/day, total 1.2–1.6 g/kg)
“Protein is the foundation of satiety. Quality fat provides stable energy. Muscle mass protects metabolism.”
Today check every meal: is there a protein source? In the evening note which meal made you feel full the longest—and what was in it.
- Protein source at every meal
- Breakfast with at least 25–30 g protein
- Observe CGM[G] after protein-rich meal—if no CGM[G]: hunger scale 2 hours after
- 20-minute walk after meals
- Mental task: which meal gave the longest fullness?—note the meal’s protein and fat content; we’ll optimize this tomorrow
- Use natural fats for cooking (olive oil, butter)
- Avoid industrial trans fats: read the label, skip “partially hydrogenated vegetable oil”
- Incorporate omega-3 source: fish, walnuts, flax or chia seeds
- Step count at least 7900
- Mental task: look at yesterday’s notes—did the longest satiety meal contain a quality fat source? If yes, this protein + fat combination works for you
- Every meal: protein + quality fat + fiber
- Compare CGM[G] curves across three days—if no CGM[G]: compare hunger scale values
- Keep meal times stable
- Fluid intake: minimum 2.0 l
- Mental task: when did you not need to snack?—note that meal; this is the pattern worth standardizing
- body weight;
- meal times and contents (Y–N);
- walk after meals (Y/N);
- snacking (Y/N);
- snack contents (list);
- daily protein intake (g);
- energy density[G] (0/+/++);
- NOVA[G] level;
- sleep quality (1–5);
- hunger scale (1–5);
- stress level (1–5);
- step count;
- bedtime / wake time (AC, AD);
- stool Bristol (1-7);
- bloating;
- flare-up (Y/N);
- daily bowel movements;
- fluid intake (l);
- CGM[G] note (AP, optional);
- UltraBiome dose;
- LOT identifier;
This 3-day period aims to preserve muscle mass, stabilize appetite signals, reduce glucose fluctuation, and provide adequate nutrient delivery to the microbiota[G].
References
[120] Calder, P. C. Omega-3 fatty acids and inflammatory processes: from molecules to man. Biochem Soc Trans. 2017. Link
Review of omega-6 and omega-3 fatty acid roles in inflammation. EPA and DHA from oily fish or fish-oil supplements partly inhibit leucocyte chemotaxis, adhesion molecule expression, leucocyte-endothelial interactions, and the production of arachidonic-acid-derived eicosanoids and pro-inflammatory cytokines. EPA-derived eicosanoids are typically less potent than those from arachidonic acid, and EPA/DHA give rise to anti-inflammatory and inflammation-resolving mediators (resolvins, protectins, maresins), supporting their use in inflammatory conditions.