Thyroid and Weight Gain: What Women Need to Know -Day 58

Can hypothyroidism cause weight gain or make it impossible to lose fat? Does your thyroid really slow your metabolism after 35?

Day 58 of the Body Recomposition Revolution breaks down thyroid function, hypothyroidism, Hashimoto’s, metabolism and weight gain in women after 35.

Want the workouts? Join me inside the⁠ RAC Collective.⁠

We’re simplifying TSH, T3 and T4, then busting some of the biggest thyroid myths using research from the American Thyroid Association, Mayo Clinic, UT Physicians and a 2025 systematic review and meta-analysis.

You’ll learn why hypothyroidism can lower metabolic rate, why thyroid-related weight gain is generally more modest than many women believe, why some of that scale weight can be salt and water, and why fatigue + weight gain alone don’t automatically mean you have a thyroid problem.

Plus, we’re covering one of the most fascinating findings of the episode: the relationship goes both ways. Thyroid hormones can influence body weight, but changes in body weight and energy stores can influence thyroid hormone signaling too.

The takeaway: hypothyroidism is real and deserves appropriate treatment, but it does not make fat loss impossible or erase the fundamentals of body recomposition.

Podcast in your ears. Recomp tips in your feed on Insta @RACfitness_

RAC Daily 3 Targets

1. Hydrate: Aim for 80–100 oz of water today.

-And sometime today, check the salt in your kitchen. Does it actually say iodized? Just to be aware to so you can start noticing where your iodine comes from-

2. Pre-log your food: Enter your next 3 days of meals into your macro tracker ahead of time. Build the system before you need the motivation.

3. Train hard: On the final working set of each exercise, aim to finish approximately 1–3 reps in reserve while maintaining good form.