What are Macros? Why are They Important for Weight Loss, Health, and Performance.

A Beginner's Guide to Mastering Your Macros

When it comes to nutrition, you’ve probably heard the term “macros” thrown around. Maybe someone at the gym is tracking their macros, or a fitness influencer is preaching about getting the right balance. But what are macros, and why do they matter for your health and fitness goals?

In this guide, I'll break down macronutrients (aka macros) in a simple, easy-to-understand way—no confusing jargon, just the facts you need to fuel your body and feel your best.

Some of the questions I will answer are:

• How many grams of protein do you need and how many calories from protein you get?
• How physical activity can effect your calorie needs?
• What macro calculators are?
• What types of foods contain protein, carbs, fats?
• How macros effect bodily functions?
• How macros contribute to weight management?
• Why macros are an important part of a healthy diet?

1. What Are Macros?

Macros is short for macronutrients, which are the nutrients your body needs in large amounts to function properly. There are three primary macronutrients:

• Protein: Essential for muscle repair, growth, and overall body maintenance.
• Carbohydrates: Your body’s main source of energy.
• Fats: Crucial for hormone production, brain health, and energy.

These nutrients provide the daily calories (or energy) your body uses to perform daily functions—from breathing to lifting weights to simply walking around.

Bonus Macro: The Power of Fibre

While not officially a macronutrient, fibre plays a crucial role in digestion, gut health, and keeping you fuller for longer. It helps regulate blood sugar levels, supports heart health, and keeps everything moving smoothly (you know what I mean). You’ll find fibre in whole grains (oats, brown rice, quinoa), legumes (lentils, beans, chickpeas), fruits (apples, berries, pears), and vegetables (broccoli, carrots, spinach). Aim for a mix of soluble fibre (which slows digestion and stabilises blood sugar) and insoluble fibre (which helps with regularity). It’s a small change with big benefits!

2. Why Are Macros Important?

While counting calories can give you a general idea of your daily intake of energy, macros tell you where those calories are coming from. Balancing your macros has potential benefits with:

• Optimizing energy levels throughout the day
• Supporting muscle mass and recovery after workouts
• Regulating hormones and metabolism for overall well-being
• Improving overall health
• Help with body composition goals

Whether your goal is weight loss, muscle gain, or simply feeling more energised, understanding macros can be a game-changer. 

3. The Three Macronutrients Explained

Protein

• Role: Builds and repairs tissues, supports immune function, helps with satiety helps build muscle mass.
• Sources of protein include: All animal sources such Red meats, white meats, fish, pork, eggs, nuts, and dairy. Even things like tofu, legumes, and protein powders will help boost your intake.
• Calories per gram: 4 kcal

Protein is often called the "building block" of life because every cell in your body contains it. Adequate protein intake can also support healthy skin, hair, and nails. Learn more about protein sources.

How many grams of protein do you need per day? Well that varies. Things like body weight, sex, activity level and most importantly your GOAL will determine how many grams you need.General the number ranges from 0.8kg/kg of body weight to 2.2g/kg of body weight. Below is a general guide.

General Recommendations:

1. Sedentary Adults: The Recommended Dietary Allowance (RDA) for protein is 0.8 grams per kilogram (0.36 grams per pound) of body weight per day. This means:

• A 70 kg (154 lb) person needs about56 grams of protein daily.
• A 60 kg (132 lb) person needs about48 grams daily.

2. Active Individuals & Athletes:

• Endurance athletes:1.2–1.4 g/kg (0.54–0.64 g/lb)
• Strength athletes:1.6–2.2 g/kg (0.73–1 g/lb)

3. Older Adults (65+ years): Due to muscle loss with aging, protein intake of 1.0–1.2 g/kg (0.45–0.55 g/lb) is recommended.

4. Weight Loss & Muscle Gain: Higher protein intake (around 1.6–2.2 g/kg) can help preserve muscle mass and support metabolism.

5. Pregnant & Lactating Women: Needs increase to about 1.1 g/kg to support fetal growth and milk production.

Carbohydrates

• Role: The body's primary fuel source, especially for the brain and during exercise (depending on intensity).
• Examples of food: Whole grains, fruits, vegetables, potatoes, pasta, rice, even sugar.
• Calories per gram: 4 kcal

Carbs often get a bad rap, but they are essential. Your brain alone consumes about 20% of your daily energy needs, and it relies heavily on glucose, which comes from carbs. 

Fats

• Role: Supports cell structure, hormone production, nutrient absorption, and long-lasting energy.
• Foods rich in fat: Avocados, nuts, seeds, olive oil, fatty fish.
• Calories per gram: 9 kcal

Healthy fats improve brain function, support heart health, and can even reduce inflammation. Omega-3 fatty acids, found in foods like salmon and walnuts, are particularly beneficial.

4. How to Calculate Your Macros

Everyone's macro needs are different based on factors like age, body weight, activity level, genetics and goals. This is why one size fits all doesn't work.

Step 1: Determine Your Caloric Needs

Use an online TDEE (Total Daily Energy Expenditure) calculator (I will be adding my own calculator to the website soon ) to estimate how many daily calories you burn daily. This will help work out how many calories per day you need. Remember it's just an estimate because no calculator can include genetics. However with enough time and consistency you will begin to understand your own genetics and how they affect your calorie needs.

Step 2: Set Your Macro Ratios/Macro Breakdown

Common macronutrient ratio starting points: (However these vary quite a lot in the real world)

• Weight Loss: 40% protein, 30% carbs, 30% fat
• Muscle Gain: 30% protein, 40% carbs, 30% fat
• Maintenance: 30% protein, 35% carbs, 35% fat

Step 3: Adjust as Needed

Track your progress and tweak based on how your body responds.

Pro Tip: Your macro needs will shift in time based on changes in activity level, muscle mass, weight, and health goals. Reassess every few months. 

5. Tracking Macros: Tools to Macro Counting Easy

Keep your Food Journal Digital with these Apps:

• MyFitnessPal
• Cronometer
• Lose It!
• MyNetDiary

These apps let you log your meals, track macros, and adjust macro counting goals as needed. You'll also be able to track your nutrition with the Kelly's Coaching App if you have Online Personal Training or Personal Training in Milton Keynes

With any service you have with me I set your macro for you and take care of all the adjustments. Meaning there is ZERO guess work for you.

Manual Tracking:

Prefer old-school methods? Keeping a food journal and learning portion sizes can be just as effective once you're familiar with macro basics. Whichever method you choose. I would suggest buying some digital food scales.

6. Common Macro Myths Debunked

• Myth 1: “Carbs make you fat.”
  Truth: Overeating calories causes weight gain, not carbs specifically. In fact, carbs are essential for brain function and energy. 

• Myth 2: “Fats are bad for you.”
  Truth: Healthy fats are essential for hormone balance and brain health. It's about choosing the right kinds of fats. 

• Myth 3: “You need tons of protein to build muscle.”
  Truth: While protein intake is important, balance is key. Excess protein won’t magically add more muscle without proper training and recovery. 

• Myth 4: “If I hit my macros, diet quality doesn’t matter.”
  Truth: Nutrient-dense foods provide vitamins and minerals your body needs beyond just macros. 

7. How Macros Support Different Goals

• For Fat Loss: Higher protein helps preserve muscle while in a calorie deficit. 
• For Muscle Gain: More carbs fuel workouts and support recovery.
• For Performance: Balanced macros ensure sustained energy and endurance. 
• For Health Maintenance: A well-rounded macro ratio supports metabolic health and reduces the risk of chronic diseases. 

8. Adjusting Macros for Your Lifestyle

Your macro needs will change based on:

• Activity level (e.g., training for a marathon vs. strength training)
• Life changes (e.g., pregnancy, menopause)
• Health conditions (consult a professional for medical needs)

Lifestyle Considerations:

• Vegetarian/Vegan: Focus on plant-based proteins like lentils, quinoa, and tofu. Vegan protein sources.
• Busy Schedules: Meal prepping can help you stay on track even on hectic days. Meal prep guide.

9. Do You Need to Track Macros Forever?

No! Tracking macros is a tool, not a life sentence. Once you understand portion sizes and how your body responds to food, you can shift to more intuitive eating while maintaining results.

Many people find that after a few months of tracking, they naturally learn what balanced meals look like. 

10. Practical Tips for Hitting Your Macros

• Plan meals ahead of time. Meal prepping helps you stay on track. Meal prep ideas.
• Prioritise protein in every meal.
• Don’t fear healthy fats; they keep you full and satisfied.
• Snack smart: Greek yogurt, nuts, boiled eggs, etc. Healthy snack ideas.
• Stay hydrated: Sometimes thirst is mistaken for hunger, leading to unnecessary snacking. Hydration tips.
• Flexible eating: Enjoy occasional treats while staying within your macro goals.

11. Ready to Master Your Macros?

Understanding macros can transform how you fuel your body, helping you achieve goals like fat loss, muscle gain, or improved performance. The key is to stay consistent, flexible, and open to adjusting as needed.

Need help figuring out your macros? Then I'm just a click away. Not only will I set your macros. I'll also take care of all the adjustments as well. Online Personal Training

Personal Training Milton Keynes, Cranfield, Newport Pagnell and surrounding areas.