From the Lab

IIFYM for the Slim Woman: 135–160 lbs, Recomp Phase

Name: XPERFORMANCELAB
Rating: 5.0

          May 29, 2026
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          By Xavier Savage
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          Slim
        

IIFYM for the Slim Woman: 135–160 lbs, Recomp Phase

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If you’re a woman at 135 to 160 pounds who has tried strict diets and hated the feeling of being told what you can and cannot eat, IIFYM – If It Fits Your Macros – is the framework that gives you complete dietary flexibility while still producing recomp results. But flexibility is not a license to eat junk food. I’ve seen more women fail on IIFYM than any other approach because they treat “flexible” as “anything goes.”

I’m Xavier Savage, a personal trainer based in Houston, Texas. IIFYM is one of my most recommended protocols for Slim archetype women who travel frequently, eat out often, or have family obligations that make rigid meal plans impossible. I work with clients across the US, Canada, and the UK through XPL online training, and the women who succeed on IIFYM are the ones who track accurately and understand the difference between macro targets and food quality.

What IIFYM Actually Is – Mechanically

IIFYM stands for If It Fits Your Macros. You set daily targets for protein, carbohydrates, and fat based on your body weight, goal, and activity level. Any food can be eaten as long as it fits within those daily targets. No foods are eliminated. Food choices are tracked via an app (MyFitnessPal, Cronometer, or similar).

Common misconception: IIFYM is not a license to eat junk food. Micronutrient deficiency is a real risk if your food quality is consistently poor. The framework works best when 80‑90% of your intake comes from whole foods and 10‑20% is flexible for treats, restaurant meals, or social situations.

The mechanism is simple: energy balance (calories in vs calories out) determines weight change. Macronutrient distribution determines body composition change. Protein protects muscle. Carbs fuel training. Fat supports hormones. IIFYM lets you manipulate all three while living a normal life.

Exact Numbers – IIFYM for Slim Recomp

Daily calories: 1,700‑2,000. Macronutrient split: Fat 25%, Protein 40%, Carbohydrates 35%. At 1,850 calories: Fat 51g, Protein 185g, Carbs 162g.

Minimum daily protein: 130g. Same protein sources as the high‑protein protocol: chicken, turkey, fish, eggs, Greek yogurt, cottage cheese, whey or plant protein. Protein is the only macro you cannot afford to miss – the other two can flex.

Carbohydrate flexibility: Carbs can come from any source – sweet potatoes, rice, oats, fruit, vegetables, or even pasta and bread if they fit your numbers. The trade‑off is that refined carbs are less satiating and may leave you hungry later.

Fat flexibility: Fat can come from whole food sources (avocado, nuts, olive oil) or from cooking oils, butter, or even higher‑fat meats. Keep saturated fat moderate for heart health, but within your numbers, it fits.

Tracking requirements: Use a food scale for at least the first 2‑4 weeks. Volume and cup measurements are inaccurate. After you develop accurate portion estimation, you can scale back to occasional tracking.

Water: 80‑100 ounces daily.

One‑Day Sample Meal Plan (1,850 calories, 185g protein, 162g carbs, 51g fat)

Breakfast: 3 eggs + 2 slices whole grain toast + 1 tbsp butter – about 470 calories, 25g protein

Lunch: 6 oz chicken breast + 1 cup brown rice + vegetables – about 520 calories, 55g protein

Snack: 1 scoop whey protein + 1 banana – about 220 calories, 26g protein

Dinner: 6 oz salmon + 1 medium sweet potato + side salad – about 600 calories, 45g protein

Flexible treat (fits remaining macros): 1/2 cup light ice cream – about 150 calories

Timeline

Week 1‑2: Tracking learning curve. Most women are shocked at how much they were previously under‑eating protein and over‑eating fat. Use a food scale.

Week 4: Tracking becomes automatic. Body composition changes begin. Energy levels stable.

Week 12: Consistent recomp progress. You can now estimate portions accurately without tracking every day – use periodic tracking (2‑3 days per week) to stay on target.

For the training protocol that pairs best with IIFYM’s carbohydrate flexibility, see the glutes protocol and the quads protocol. For a no‑tracking alternative, the Paleo protocol removes processed foods without counting. Take the XPL Archetype Quiz to confirm your archetype.

I train clients in person in Houston, Texas and work with people across the US, Canada, and the UK online through XPL. Take the XPL Archetype Quiz to get your exact protocol, or visit xperformancelab.com/plans-pricing to work with me directly.

The standards behind the standards. — Xavier Savage, XPL Xesthetic Performance Labs, Houston, TX