Total Daily Energy Expenditure (TDEE)

To provide tailored advice for weight loss, muscle gain, and maintenance of weight based on the user’s parameters (44 years old, 375.92 cm, 31.3 kg, female, TDEE of 3,342 kcal/day), we'll take into account her very low weight (which warrants consultation with a healthcare professional). However, based on the information given, here are general recommendations for diet, exercise, and lifestyle changes for each goal:

1. Weight Loss

Diet Recommendations

• Daily Caloric Intake: Aim for approximately 2,500 kcal/day to create a deficit for gradual weight loss.
• Macronutrient Breakdown:
  • Protein: 20% (500 kcal → 125g)
  • Fats: 30% (750 kcal → 83g)
  • Carbohydrates: 50% (1,250 kcal → 312g)

Sample Diet Plan

• Breakfast:

  • Oatmeal (1 cup) with berries and a tablespoon of almond butter
  • Scrambled egg whites (4)

• Snack:

  • Greek yogurt (1 cup) with a tablespoon of honey and nuts

• Lunch:

  • Grilled chicken breast (150g) with mixed salad (spinach, tomatoes, cucumbers) and vinaigrette
  • Quinoa (1/2 cup)

• Snack:

  • Carrot sticks (2 large) with hummus (1/4 cup)

• Dinner:

  • Baked salmon (150g) with steamed broccoli and sweet potato (1 medium)

• Evening Snack:

  • Apple with peanut butter (1 tablespoon)

Exercise Plan

• Frequency: 5 times/week
• Duration: 60 minutes per session
• Types of Exercises:
  • Monday: 30 minutes cardio (running or cycling) + strength training (full body)
  • Tuesday: High-Intensity Interval Training (HIIT) for 20 minutes + strength training for 30 minutes
  • Wednesday: Moderate cardio (swimming or brisk walking) for 45 minutes
  • Thursday: Rest or light yoga/stretching
  • Friday: 30 minutes cardio + circuit strength training
  • Saturday: Outdoor activity (hiking, biking) for 60 minutes
  • Sunday: Rest or light stretching

Lifestyle Changes

• Sleep: Aim for 7-9 hours of sleep per night.
• Stress Management: Practice mindfulness, meditation, or yoga.
• Motivation Tips: Set small, achievable goals; track progress in a journal; reward achievements.

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2. Muscle Gain

Diet Recommendations

• Daily Caloric Intake: Aim for approximately 3,500 kcal/day to support muscle growth.
• Macronutrient Breakdown:
  • Protein: 25% (875 kcal → 219g)
  • Fats: 30% (1,050 kcal → 117g)
  • Carbohydrates: 45% (1,575 kcal → 394g)

Sample Diet Plan

• Breakfast:

  • Protein smoothie (whey protein, banana, spinach, milk)
  • Whole grain toast with avocado

• Snack:

  • Cottage cheese (1 cup) with flaxseeds and a fruit

• Lunch:

  • Turkey breast (200g) sandwich on whole grain bread with cheese and veggies
  • Brown rice (1 cup)

• Snack:

  • Protein bars or nuts (handful)

• Dinner:

  • Grilled chicken or beef (200g) with asparagus and mashed potatoes (1 cup)

• Evening Snack:

  • Casein protein shake before bed

Exercise Plan

• Frequency: 5-6 times/week
• Duration: 60-90 minutes per session
• Types of Exercises:
  • Monday/Thursday: Upper body strength focus (bench press, rows, shoulder press, tricep extensions)
  • Tuesday/Friday: Lower body strength focus (squats, deadlifts, lunges)
  • Wednesday: Mixed strength and cardio (circuit training)
  • Saturday: Active recovery (yoga/stretching)
  • Sunday: Rest

Lifestyle Changes

• Sleep: Prioritize quality sleep to aid recovery.
• Stress Management: Incorporate recovery techniques such as foam rolling or massages.
• Motivation Tips: Join a gym or workout group; track lifting progress.

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3. Maintenance of Weight

Diet Recommendations

• Daily Caloric Intake: Aim for approximately 3,342 kcal/day (TDEE).
• Macronutrient Breakdown:
  • Protein: 25% (835 kcal → 209g)
  • Fats: 30% (1,000 kcal → 111g)
  • Carbohydrates: 45% (1,500 kcal → 375g)

Sample Diet Plan

• Breakfast:

  • Omelet (3 whole eggs, veggies) and toast

• Snack:

  • Smoothie with protein powder, banana, spinach, and nut butter

• Lunch:

  • Grilled fish or chicken salad with chickpeas and olive oil dressing
  • Whole grain bread

• Snack:

  • Mixed nuts or trail mix

• Dinner:

  • Stir-fried tofu and vegetables with brown rice (1 cup)

• Evening Snack:

  • Dark chocolate (30g) with fresh fruit

Exercise Plan

• Frequency: 4-5 times/week
• Duration: 45-60 minutes per session
• Types of Exercises:
  • Monday/Thursday: Moderate cardio (jogging or cycling)
  • Tuesday/Friday: Strength training (full body)
  • Wednesday/Saturday: Recreational activities (dance class, sports)
  • Sunday: Rest

Lifestyle Changes

• Sleep: Maintain a routine with consistent sleep patterns.
• Stress Management: Engage in regular leisure activities and hobbies.
• Motivation Tips: Set new goals; track dietary and exercise progress.

Important Note

Given the user's unique body parameters, it is crucial to consult a healthcare professional or a registered dietitian for personalized recommendations tailored to her health needs, especially considering her weight relative to height. The information provided here is a general guideline and should be adapted under professional supervision.