Diet and Exercise — My Weight Loss Journey

The physiology

What actually drives fat loss

Fat loss occurs when energy expenditure consistently exceeds energy intake — creating a caloric deficit. This is the inescapable physiological reality, regardless of what any diet approach claims. The debate is not about whether calories matter; it is about which approach to managing them is most sustainable, healthful and compatible with preserving lean muscle mass.

The key variables that determine success are: the size of the caloric deficit, the protein content of the diet (which determines whether lean mass is preserved or lost alongside fat), resistance training (which signals muscle preservation even in a deficit), and the consistency maintained over time.

Metabolic adaptation — what it is and why it matters

As weight loss progresses, the body adapts — reducing basal metabolic rate, increasing appetite-stimulating hormones, and becoming more efficient with energy. This is why weight loss slows over time even with the same approach. Understanding this adaptation — and having strategies to manage it — is the difference between reaching your goal and plateauing 70% of the way there.

Amy Kellner APD specialises in metabolic adaptation management — developing dietary and activity strategies that maintain deficit momentum without triggering excessive metabolic compensation.

The four pillars of sustainable fat loss

01 — Protein first, always

Target 1.6–2.2g of protein per kilogram of body weight daily. This is the single most important dietary variable for preserving lean muscle mass during weight loss. High protein intake also improves satiety, reduces late-night eating and supports long-term maintenance.

02 — Resistance training is non-negotiable

Cardio burns calories during exercise. Resistance training reshapes body composition and raises resting metabolic rate permanently — as long as muscle mass is maintained. 3–4 sessions per week of progressive resistance training is the minimum effective dose for body composition change.

03 — Caloric deficit — sustainable not severe

A deficit of 500–750 calories per day produces ~0.5–0.75kg of fat loss per week. Larger deficits accelerate muscle loss, increase metabolic adaptation and reduce adherence. Slower, sustainable deficit — paired with high protein and resistance training — produces better body composition than crash dieting.

04 — Consistent tracking — what gets measured gets managed

Dietary recall studies consistently show people underestimate their food intake by 30–50%. Accurate tracking — even for a short period — reveals the gap between perception and reality that explains most stalled progress. Work with Amy Kellner APD to establish tracking habits that are sustainable and honest.

Planning ahead

Achieving significant weight loss through lifestyle — what to expect for your skin

Lifestyle-mediated weight loss — particularly when it involves 20kg or more — can produce significant skin laxity in the same way that GLP-1 medications and bariatric surgery do. The degree depends on total weight lost, speed of loss, age, genetics and skin quality.

For patients who achieve meaningful weight loss through diet and exercise and are then faced with loose skin, body contouring surgery with Dr Kumar provides the same solutions available to patients who lost weight through any other pathway. The surgical approach is the same; the clinical requirements (weight stability, nutritional optimisation) are the same; the outcomes are comparable.

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Scientific illustration of skin elasticity loss following weight loss

Expert nutritional support

Diet and exercise work best
with an expert alongside you.

Amy Kellner APD provides evidence-based dietary support for patients on the natural weight loss pathway — protein planning, metabolic adaptation management, body composition optimisation and long-term maintenance planning.

Book with Amy Kellner APD →

Diet & exercise —done properly.