Nutrition Basics for Exercise: Simple Fueling Principles

You can't out-train a bad diet, but you also don't need a PhD in nutrition to fuel your workouts properly.

This guide covers the essential nutrition principles for exercise—what to eat, when to eat it, and how much. No fads, no extremes, just fundamentals that work.

---

The Big Picture

Calories: The Foundation

Calories determine weight change:

• Surplus (eating more than you burn) → Weight gain
• Deficit (eating less than you burn) → Weight loss
• Maintenance (eating what you burn) → Weight stable

Your goals dictate your calories:

| Goal | Calorie Target | |------|----------------| | Lose fat | 300-500 below maintenance | | Maintain | At maintenance | | Build muscle | 200-400 above maintenance |

Estimating maintenance:

• Bodyweight (lbs) × 14-16 = rough maintenance calories
• More active = higher multiplier
• Track and adjust based on actual results

Protein: The Priority

Protein builds and repairs muscle tissue.

How much:

• 0.7-1.0 g per pound of bodyweight daily
• Higher end when cutting or training hard
• Example: 180 lb person → 125-180 g protein daily

Why it matters:

• Preserves muscle during fat loss
• Supports muscle growth during surplus
• Most satiating macronutrient (keeps you full)

Carbohydrates: The Fuel

Carbs power intense exercise.

How much:

• Varies widely based on activity level and goals
• More training volume = more carbs needed
• Generally 2-4 g per pound bodyweight for active people
• Can be lower for sedentary or fat loss focus

When they matter most:

• Before and after training
• During high-volume training periods
• For performance-focused athletes

Fats: The Essential

Fats support hormones, brain function, and vitamin absorption.

How much:

• Minimum 0.3-0.4 g per pound bodyweight
• Typically 20-35% of total calories
• Don't go too low—hormones suffer

Focus on:

• Variety of sources
• Some saturated, more unsaturated
• Omega-3s (fish, flaxseed, walnuts)

---

The Simple Plate Method

Don't want to count calories or macros?

Build each meal:

• 1/4 plate protein: Meat, fish, eggs, tofu, legumes
• 1/4 plate carbs: Rice, potatoes, bread, pasta, fruit
• 1/2 plate vegetables: Any kind, the more variety the better
• Thumb of fat: Olive oil, nuts, avocado, butter

Eat 3-4 meals like this daily. Adjust portions based on hunger and results.

---

Pre-Workout Nutrition

Why It Matters

Eating before training:

• Provides energy for performance
• Prevents muscle breakdown
• Keeps blood sugar stable
• Improves focus

Timing Options

2-4 hours before (full meal):

• Complete meal with protein, carbs, fat
• Allows full digestion
• Ideal if schedule permits

1-2 hours before (moderate meal):

• Smaller portion, lower fat/fiber
• Easier digestion
• Still provides good energy

30-60 minutes before (small snack):

• Quick-digesting carbs
• Optional small protein
• Minimal fat/fiber

Fasted training:

• Works fine for low-moderate intensity
• May limit performance in high-intensity or long sessions
• Personal preference

What to Eat

2-4 hours before:

• Chicken, rice, and vegetables
• Eggs, toast, and fruit
• Pasta with meat sauce and salad
• Any balanced meal

1-2 hours before:

• Greek yogurt with fruit
• Banana and peanut butter
• Small sandwich
• Oatmeal with protein powder

30-60 minutes before:

• Banana
• Rice cakes
• Sports drink
• Small handful of dried fruit

What to Avoid Before Training

• Very high fat meals (slow digestion)
• Very high fiber meals (GI discomfort)
• Large portions (heaviness)
• Foods that upset YOUR stomach (individual)
• New foods (stick with familiar)

---

Post-Workout Nutrition

The "Anabolic Window" Truth

The myth: You must eat within 30 minutes or gains are lost.

The reality:

• The "window" is 2-3 hours, not 30 minutes
• If you ate pre-workout, there's even less urgency
• Total daily nutrition matters more than timing

That said: Eating within 1-2 hours post-workout is still a good practice.

What to Eat After Training

Goals:

• Protein for muscle repair
• Carbs to replenish glycogen
• Rehydration

Good post-workout meals:

• Protein shake with banana
• Chicken and rice
• Eggs and toast
• Greek yogurt with fruit and granola
• Tuna sandwich

Amounts:

• 20-40 g protein
• Carbs based on workout intensity (more volume = more carbs)

Recovery Nutrition

Beyond the immediate post-workout:

• Continue eating protein throughout the day (every 3-5 hours)
• Prioritize sleep (when real recovery happens)
• Stay hydrated
• Eat adequate total calories

---

Hydration

Why It Matters

Even mild dehydration:

• Decreases performance (2% bodyweight loss = significant decline)
• Increases fatigue
• Impairs concentration
• Slows recovery

How Much to Drink

Daily baseline:

• Bodyweight (lbs) ÷ 2 = ounces of water
• Example: 180 lbs → 90 oz (about 11 cups)
• More if active, hot, or high altitude

Around training:

• 16-20 oz 2-3 hours before
• 8-12 oz during (more if sweating heavily)
• 16-24 oz after

Signs of Dehydration

• Thirst (already behind)
• Dark yellow urine
• Headache
• Fatigue
• Decreased performance
• Dizziness

Aim for: Pale yellow urine throughout the day

When You Need More Than Water

Electrolytes matter if:

• Training over 60-90 minutes
• Heavy sweating
• Hot environment
• Multiple sessions per day

Options:

• Sports drinks
• Electrolyte tablets
• Salt + water
• Coconut water

---

Nutrition for Specific Goals

Fat Loss

Key principles:

• Caloric deficit (300-500 below maintenance)
• High protein (1 g per pound bodyweight)
• Adequate fiber (keeps you full)
• Mostly whole foods (more satiating)

Practical tips:

• Prioritize protein at every meal
• Eat vegetables with every meal
• Limit liquid calories
• Don't drink your calories (except protein shakes)
• Allow some flexibility (sustainability)

Muscle Building

Key principles:

• Caloric surplus (200-400 above maintenance)
• High protein (0.8-1 g per pound bodyweight)
• Adequate carbs (fuel training)
• Eat frequently (stimulate protein synthesis)

Practical tips:

• 4+ meals per day
• Protein every 3-5 hours
• Don't fear carbs—they help
• Be patient (muscle builds slowly)
• Track to ensure you're actually in surplus

Performance/Athletics

Key principles:

• Adequate calories for training demands
• Periodize carbs with training volume
• Prioritize recovery nutrition
• Focus on whole foods as base

Practical tips:

• More carbs on high-volume days
• Less carbs on rest days (if needed)
• Don't under-fuel (performance suffers)
• Consider a sports dietitian for serious competition

General Health/Fitness

Key principles:

• Eat mostly whole foods
• Adequate protein
• Variety of vegetables
• Moderate everything
• Sustainable habits

Practical tips:

• 80/20 rule (80% whole foods, 20% whatever)
• Don't be extreme
• Focus on consistency, not perfection
• Make small changes over time

---

Common Questions

"Should I Eat Before Morning Workouts?"

It depends:

• Low-moderate intensity: Fasted is fine
• High intensity or long duration: Some fuel helps
• Personal preference matters

If you train fasted:

• Have water
• Consider BCAAs or small protein if muscle preservation is concern
• Eat soon after

"How Much Protein Per Meal?"

Research suggests:

• 20-40 g per meal optimizes muscle protein synthesis
• Distribute throughout day (not all at once)
• 4-5 protein feedings daily is ideal

"Are Supplements Necessary?"

For most people, not necessary. Potentially helpful:

• Protein powder: Convenient, not magic
• Creatine: Well-researched, effective for strength/power
• Vitamin D: If deficient (many people are)
• Fish oil: If you don't eat fish regularly

Skip: Most fat burners, testosterone boosters, "proprietary blends"

"What If I'm Not Hungry After Working Out?"

Options:

• Protein shake (easier to consume)
• Wait until appetite returns (within 2 hours ideally)
• Start small and eat more later
• Don't force massive meals

"Does Meal Timing Really Matter?"

For most people:

• Total daily intake matters most
• Timing is a minor optimization
• Don't stress about exact timing if hitting daily targets

Timing matters more if:

• Training multiple times per day
• Competitive athlete
• Training very long duration
• Already dialed in and looking for small gains

---

Sample Day of Eating

For a 180 lb Person Training in the Evening

Goal: Maintain weight, support training

Breakfast (7am):

• 3 eggs scrambled
• 2 slices whole grain toast
• 1 cup berries
• Coffee

~35g protein, 40g carbs, 20g fat

Lunch (12pm):

• 6 oz grilled chicken
• 1.5 cups rice
• Large mixed salad with olive oil dressing
• Water

~45g protein, 60g carbs, 15g fat

Pre-Workout Snack (5pm):

• Greek yogurt (1 cup)
• Banana
• Water

~20g protein, 40g carbs, 2g fat

Training (6pm)

• Water during

Post-Workout Dinner (7:30pm):

• 6 oz salmon
• Baked potato with butter
• Steamed broccoli
• Water

~40g protein, 50g carbs, 20g fat

Evening Snack (9pm):

• Protein shake with milk
• Handful of almonds

~30g protein, 15g carbs, 15g fat

Daily totals: ~170g protein, ~205g carbs, ~72g fat, ~2,100 calories

---

Quick Reference

Pre-Workout (1-2 hours before)

• Moderate carbs + some protein
• Lower fat and fiber
• Familiar foods

Post-Workout (within 2 hours)

• 20-40g protein
• Carbs based on training intensity
• Rehydrate

Daily Targets

• Protein: 0.7-1.0 g per lb bodyweight
• Water: Half bodyweight (lbs) in oz
• Meals: 3-5 with protein each
• Vegetables: Every meal if possible

Goal-Based Adjustments

• Fat loss: Caloric deficit, high protein, high fiber
• Muscle gain: Caloric surplus, high protein, adequate carbs
• Performance: Match fuel to training demands

---

Key Takeaways

1. Calories determine weight change - Surplus to gain, deficit to lose
2. Protein is priority - 0.7-1.0 g per pound bodyweight
3. Timing is minor compared to totals - Hit daily targets first
4. Pre-workout: Some carbs + protein, avoid heavy/fatty meals
5. Post-workout: Protein + carbs within 2 hours
6. Stay hydrated - Half your bodyweight (lbs) in ounces
7. Keep it simple - Whole foods, adequate protein, consistency
8. Sustainability wins - The best diet is one you'll actually follow

Nutrition doesn't need to be complicated. Master the basics before worrying about advanced strategies.