Why Intermittent Fasting, Cleanses, and Extreme Diets Often Backfire for Women Over 40

Rachel came in exhausted.

She was intermittent fasting 16 hours daily.

Strength training three times per week.

Walking daily.

Sleeping six hours per night.

She thought she needed more discipline. She needed more fuel.

Intermittent Fasting and Protein Distribution

Intermittent fasting can create calorie control.

But in midlife women who are strength training, the issue often becomes protein distribution.

Research shows muscle protein synthesis is stimulated when adequate protein is consumed across multiple meals.

With age, anabolic resistance increases. This means your body requires a stronger stimulus, both from resistance training and from protein intake, to maintain lean mass.

Compressing food intake into narrow windows often leads to:

  • Lower total protein intake
  • Inadequate distribution
  • Increased stress load
  • Reduced recovery

For some women, fasting works.

For many midlife strength-training women, it compromises muscle preservation.

Cleanses and Detoxes

Juice cleanses produce rapid scale changes.

Those changes are primarily:

  • Glycogen depletion
  • Water loss
  • Reduced digestive bulk

The liver and kidneys already perform detoxification.

What cleanses often reduce is protein intake.

When protein drops, muscle preservation becomes harder.

Muscle supports metabolic health.

Protecting muscle should be the priority.

Keto, Paleo, and Elimination Extremes

Elimination diets can feel effective because they simplify choices.

But progressive resistance training requires:

  • Adequate protein
  • Sufficient energy
  • Carbohydrate availability for performance

Low carbohydrate intake may reduce training performance in some women, especially when combined with high life stress.

Midlife bodies require recovery support, not chronic restriction.

What Actually Works

It is not flashy. It is:

  • Progressive overload
  • Adequate protein 1.6–2.2 g/kg
  • Moderate calorie adjustments
  • Sleep
  • Consistency

The fundamentals are boring. They are also durable.

Trends create urgency.  Evidence creates longevity.

If you are done chasing the next promise, start with structure.

Here are some links you might find helpful:

Here are some links you might find helpful:

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