Weight loss and energy deficit a safe approach

1. Energy Deficit – The Tool We Use Intentionally
An energy deficit simply means you are consuming fewer calories than your body burns over a given period. Used correctly – with the right size deficit, enough protein, and adequate recovery – it is a safe and evidence-based strategy for fat loss.
The key word is intentionally. A well-managed deficit:
• Is modest in size – typically 200 to 500 kcal below your total daily energy expenditure
• Prioritises protein to protect muscle mass – hence our 30g per meal target in this program
• Includes adequate fibre and micronutrients to keep hormones, digestion and immunity functioning
• Is periodised – meaning it is not a permanent state. Your body needs regular breaks

2. Low Energy Availability (LEA) – When the Deficit Becomes Too Deep
Energy Availability (EA) is not the same as calorie intake. It refers to how much energy is left over for your body to run all of its essential biological functions – after fuelling your exercise. The formula is straightforward:

Energy Availability = (Calorie Intake minus Exercise Energy Expenditure) divided by Lean Body Mass

EA will change as you cycle through your energy deficit vs energy balance periods.

Low EA develops when the gap between what you eat and what you burn through training becomes too large – whether that happens deliberately through aggressive dieting, or accidentally through under-fuelling a heavy training load. It does not require an eating disorder. It does not require extreme restriction. It can happen quietly, to women who are doing everything they think is right.

This is especially common in perimenopausal women and beyond. Hormonal shifts alter appetite signalling, increase cortisol sensitivity, and change the way the body responds to both deficit and stress. A calorie intake that felt manageable at 30 can create significant physiological disruption at 45. This is not a failure of willpower – it is biology.

3. RED-S – Relative Energy Deficiency in Sport
RED-S is what happens when Low Energy Availability is sustained over time. Originally described as the Female Athlete Triad (disordered eating, menstrual dysfunction, and low bone density), RED-S has since been expanded to recognise that the effects reach far beyond those three systems.
RED-S is a clinical syndrome. It is not a niche problem for elite athletes. Research increasingly shows it affects recreational exercisers – and women in midlife who are combining strength training with calorie restriction are a population at measurable risk.

Body systems affected by RED-S include:
• Reproductive hormones – oestrogen and progesterone suppression, irregular or absent periods
• Bone health – accelerated bone density loss, significantly elevated fracture risk
• Cardiovascular function – impaired lipid profiles, heart rate variability, and vascular health
• Immune function – increased susceptibility to illness and slower recovery from training
• Thyroid function – downregulation of metabolic rate as a survival adaptation
• Gastrointestinal health – bloating, constipation, and altered gut microbiome
• Mental health – increased anxiety, low mood, brain fog, loss of motivation to train
• Muscle and performance – muscle protein breakdown accelerates, strength gains plateau or reverse

Protecting Your Body While Still Reaching Your Goals

The answer is not to abandon your goals. It is to pursue them in a way that works with your physiology rather than against it. Here are the principles that matter most:

1. Keep the deficit modest and strategic
Aim for no more than 300 to 500 kcal below your total daily energy expenditure. On heavy training days, consider eating closer to maintenance. The body responds better to small, consistent deficits than aggressive restriction.
2. Protect your protein – every single day
For perimenopausal women and beyond (menopausal and post-menopausal) who strength train, current evidence supports 1.6 to 2.2g of protein per kg of body weight per day. This is higher than general population guidelines. Our 30g per meal framework is designed to help you reach this consistently.
3. Do not fear carbohydrates around training
Carbohydrates are your muscles’ preferred fuel source. Consuming 30 to 60g of complex carbohydrates in the hours surrounding training protects muscle, supports cortisol recovery, and preserves performance.
4. Periodise your nutrition alongside your training
Eat more on heavy training days. Eat closer to maintenance during high-stress periods. Build in diet breaks – periods of 1-2 days at maintenance calories – every 5 days in caloric deficit. This is not a setback. It is part of the strategy.
5. Treat sleep as non-negotiable nutrition
7 to 9 hours is not a luxury. It is when your muscles repair, your hormones reset, and your hunger signals recalibrate. Hormonal changes are disrupting your sleep, this is worth addressing directly – with your GP, a sleep specialist, or through targeted nutritional support.
6. Actively manage your stress load
Stress management is a nutrition intervention. Breathwork, adequate rest days, reducing training volume during high-stress periods, and even targeted nutrients like magnesium glycinate can meaningfully reduce cortisol burden and improve body composition outcomes.

A personal note from me. I wrote this blog because I see the patterns. I see women who are training consistently, eating carefully, sleeping poorly, carrying enormous loads of stress – and wondering why their body is not responding the way they expect. And often, the answer is not more restriction. It is more support.
The science of fuelling a woman’s body is genuinely nuanced. It is not one-size-fits-all. It requires understanding your individual hormonal picture, your training load, your stress context, and your history with food. That is exactly what a private nutrition consultation is designed to explore.

If anything in this blog has made you think ‘that could be me’ – please do not sit with that alone. Email me and let’s talk. Even a short conversation can clarify a lot.