I'm a dietitian, not an exercise physiologist — but I bring up strength training in nearly every weight management consultation I run. That's because nutrition and resistance training aren't separate strategies. They work together, and trying to manage weight or metabolic health through diet alone leaves real results on the table.
It's not just about burning calories
Cardio is often what people picture when they think "exercise for weight loss," but resistance training does something diet and cardio alone can't: it builds and preserves muscle. Muscle is metabolically active tissue — the more you carry, the more energy your body uses at rest. This matters enormously for long-term weight management, not just the number on the scale during a diet.
The problem with weight loss and muscle loss
When you lose weight through diet alone, a meaningful portion of what you lose is muscle, not just fat — sometimes up to a quarter of total weight lost. This is one of the biggest reasons weight regain happens after dieting: your metabolic rate drops along with your muscle mass, so your body needs fewer calories than before, making the weight easier to regain. Resistance training during a period of weight loss helps preserve muscle, which protects your metabolic rate and supports better long-term results.
Beyond weight: why I recommend it for almost everyone
- Insulin sensitivity — muscle is one of the primary sites where your body clears glucose from the blood. More muscle, and more frequently used muscle, generally means better blood sugar control.
- Bone density — resistance training places mechanical stress on bone that stimulates it to stay strong, which becomes increasingly important with age, and especially through and after menopause.
- Healthy ageing — muscle mass naturally declines from our 30s onward (a process called sarcopenia) unless we actively work against it. Maintaining strength is directly linked to independence and quality of life later in life.
- Mood and energy — resistance training is consistently linked with improved mood, better sleep and increased energy, independent of any change in weight.
How nutrition fits in
You can't out-train poor recovery. If you're taking up resistance training, your protein needs go up to support muscle repair and growth, and your overall energy intake needs to genuinely fuel the training rather than work against it. This is where the nutrition and the training really need to be considered together — a mismatch between the two (very low calorie intake plus heavy training, for example) tends to backfire.
Getting started doesn't need to be complicated
You don't need a gym membership or a complex program to get meaningful benefit. Two to three sessions a week, working the major muscle groups with a load that challenges you by the end of a set, is enough to see real change over a few months. If you're new to it, a few sessions with an accredited exercise physiologist or physiotherapist to learn good form is a worthwhile investment.
The bottom line
Nutrition and resistance training aren't competing priorities — they're partners. If weight management, metabolic health or healthy ageing are your goals, food alone is only half the picture.