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The Science Behind Sustainable Weight Loss

  • Sep 5, 2025
  • 2 min read

Daniel Lowry – Fitness Professional


Should you focus on cardio or strength training for fat loss? And what’s the most sustainable approach?


The Truth About Weight Loss: It’s Not Just Calories


At its core, fat loss requires a calorie deficit, burning more energy than you consume. Here’s why so many people struggle:

  • Ingrained eating habits built over decades

  • Highly processed, hyper-palatable foods

  • Poor satiety signalling due to genetics and body composition


The good news is, you don’t have to starve yourself to succeed.



Strength Training vs Endless Cardio


While running and cycling can help burn calories, they don’t prevent muscle loss during weight loss. Without strength training:

  • Up to 50% of weight lost can be lean muscle

  • Losing muscle lowers your basal metabolic rate (BMR), making fat loss harder

  • You risk developing sarcopenia (age-related muscle loss)


Why strength training matters:

  • Signals to your body that muscle is essential

  • Improves bone density, hormonal health and longevity

  • Leads to better body composition – more lean mass, less fat



Medical Support: Part of the Plan, Not a Shortcut


For some people, medical support can help — but it works best as one part of a bigger plan. Keep in mind:

  • There are no magic pills.

  • Without exercise and protein intake, you risk losing muscle mass instead of fat.

  • Sustainable results come from building better habits, not just relying on a single tool.



Why Crash Diets Fail


Very Low-Calorie Diets (VLCDs), often recommended in clinical settings, can produce rapid weight loss, but at a cost:

  • Severe fatigue and nutrient depletion

  • Loss of muscle and bone density

  • Poor exercise performance

  • High risk of rebound weight gain



Woman in yellow shirt looks reluctantly at broccoli on fork, sitting at table with a salad bowl. Kitchen background with tan tiles.

Instead, aim for a moderate calorie deficit combined with:

  • Protein-rich meals

  • Strength training three times per week

  • Walking and low-intensity cardio

  • Adequate sleep and recovery



Final Thoughts

If your goal is long-term fat loss, better health and a stronger body, the formula is simple:

  • Move often, but don’t overdo cardio

  • Prioritise strength training and protein

  • Use any medical support strategically, alongside the habits above

  • Build habits you can sustain for life


At SANAMethod, we help people achieve lasting transformations – not just temporary weight loss.

Ready to get started?

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