Intermittent Fasting: The Buzz, The Science, and Why It Might (or Might Not) Work for You
Fyonna Vanderwerf | SEP 1, 2025
Intermittent Fasting: The Buzz, The Science, and Why It Might (or Might Not) Work for You
Fyonna Vanderwerf | SEP 1, 2025
HEY!
Let’s cut through the noise. Intermittent fasting (IF) isn’t magic, it isn’t punishment, and it isn’t a one-size-fits-all. It’s simply an eating pattern—a window of time when you eat, and a window of time when you don’t.
Sounds simple, right? Except here’s where things get messy: fasting hits men and women differently. It feels different at 25 than it does at 55. And if you’re lifting, training, or just trying to get through the damn day without bloating or crashing, you want the facts before you go all-in.
So let’s break it down.
Most people know the 16:8 cycle—16 hours fasting, 8 hours eating. But fasting can be as light-touch as a 12:12 split (stop eating after dinner, start with breakfast 12 hours later) or as intense as 20:4. It’s a spectrum. The goal isn’t starvation. The goal is metabolic flexibility.
Here’s the kicker: men often respond better, faster to intermittent fasting. Why? Hormones. Testosterone, growth hormone, and insulin sensitivity work in their favor.
For women, it’s trickier. Hormones shift across the menstrual cycle and through menopause, making prolonged fasting sometimes backfire—leading to stress hormone spikes, sleep problems, or even muscle loss if paired with hard training.
Stacy Sims (exercise physiologist and women’s health researcher) puts it bluntly: “Women are not small men.” Long fasting windows can mess with performance, recovery, and long-term health. Her advice? Start light. Experiment. Listen to your body before locking into a rigid schedule.
In your 20s and 30s: IF can feel easier—hormones are steadier, metabolism is higher, and recovery time is faster.
In your 40s and 50s: Hormonal shifts (perimenopause, menopause, testosterone decline) mean fasting may need to be shorter, smarter, and paired with strength training to protect muscle.
Over 60: The biggest benefit of fasting might not be weight loss—it’s digestive health, reduced inflammation, and improved metabolic control. Think energy and GI balance, not deprivation.
Done well, intermittent fasting can help with:
Strength: Fasting increases growth hormone and can support lean muscle retention (especially when paired with resistance training).
Weight Loss: It helps manage insulin, which can reduce fat storage.
Bloating & GI Health: Fasting gives your gut a break, supporting microbiome balance and reducing discomfort.
Energy & Focus: No, it’s not your imagination. Many people report mental clarity during fasting windows.
Start slow: Try 12:12 before you dream of 16:8.
Hydrate: Black coffee, tea, and water are your fasting best friends.
Fuel smart during eating windows: Prioritize protein + fiber.
Don’t fear carbs: Especially if you’re lifting. Carbs = fuel.
Lift weights: Fasting without strength training = muscle loss.
Adjust for your cycle or age: Women, shorten fasting windows during luteal phase or menopause.
Sleep first: Fasting isn’t fixing anything if you’re sleeping 4 hours a night.
Watch your stress load: Fasting is stress on the body. If your life is already chaos, be cautious.
Quality over perfection: Consistency beats intensity here.
Work with a coach: Seriously—having guidance can mean the difference between success and burnout.
Intermittent fasting isn’t about skipping breakfast to punish yourself. It’s about creating rhythms that help your body heal, recover, and perform. For some people, it’s a game-changer. For others, it’s not the right tool—and that’s okay.
If you’re curious about how fasting could fit your goals—whether it’s strength, weight loss, beating the bloat, or just getting through the week with better energy—don’t wing it. Come see me at Bees Knees Wellness Muskoka.
👉 This fall, we’ve got:
Class packages starting at $250
Semi-private coaching starting at $400/month—perfect if you want accountability + community.
Private coaching starting at $600/month—personalized, science-backed, no-BS guidance to fit fasting, food, and fitness into your life.
Because at the end of the day, you don’t need another fad.
You need a plan that works for your body, your season of life, and your goals.
And that’s what we build together.
Fyonna x
Fyonna Vanderwerf | SEP 1, 2025
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