Expert Q&A

M/30/6’2” [355lbs > 265lbs] (1 Year) what’s my BF%? How much more to 18% for those with hypothyroidism or Hashimoto's

Estimating Your Body Fat Percentage After Major Loss

I've worked with thousands navigating the exact path you're on. At 6'2" and down from 355lbs to 265lbs in one year, you've lost 90 pounds—remarkable progress that demands accurate assessment. Visual estimates place most men at your stats between 22-27% body fat. Without DEXA or hydrostatic weighing, use multiple methods: caliper measurements at 7 sites, a high-quality smart scale, and progress photos under consistent lighting. My methodology in The CFP Sustainable Fat Loss Protocol emphasizes tracking trends over single snapshots because water retention from hypothyroidism fluctuates readings by 3-4%.

Impact of Hypothyroidism and Hashimoto's on Body Composition

Hypothyroidism and Hashimoto's slow metabolism by 5-15%, making the final 10-15% of fat particularly stubborn. Your thyroid medication must be optimized—TSH alone isn't enough; free T3, free T4, and reverse T3 levels matter. Many clients see an extra 8-12 weeks to drop the last 20 pounds due to these hormonal shifts. Insulin resistance often accompanies both conditions, especially if managing diabetes or blood pressure, so focus on anti-inflammatory nutrition rather than extreme calorie cuts that backfire.

How Much More to Reach 18% Body Fat

At 265lbs and roughly 24% body fat, you carry about 64lbs of fat mass. To hit 18%, you'd need to reach approximately 235-240lbs assuming lean mass preservation. That's another 25-30lbs of targeted fat loss. With hypothyroidism, expect 0.5-1lb per week sustainably—meaning 6-9 months more. My approach avoids the diet failures you've faced before by using a 20% calorie deficit on training days only, paired with resistance training 3x weekly that protects joints. No complex meal plans: simple swaps like increasing protein to 1.6g per kg of goal weight stabilize blood sugar.

Practical Steps That Work for Joint Pain and Busy Schedules

Start with daily 20-minute walks to ease joint pain, progressing to bodyweight circuits. Track waist circumference weekly—losing 1 inch typically equals 3-4% body fat drop. Optimize sleep (7-9 hours) and manage stress, as cortisol from overwhelm spikes Hashimoto's flares. Insurance barriers are real, but these evidence-based habits cost nothing. Many in their 40s with similar stories succeed long-term by rejecting all-or-nothing approaches. Consistency beats perfection. If you're embarrassed to ask for help, remember: your 90lb transformation already proves you have what it takes. Focus on feeling strong, not just the scale.

💬 What the Community Says

The community shows strong admiration for this 90lb transformation in one year, especially from men in their late 20s to mid-50s dealing with hypothyroidism. Most agree visual estimates around 23-26% body fat feel realistic without scans, but debates rage over exact targets—some push for 15% while others with Hashimoto's say 20% is more sustainable given slower metabolism and joint limitations. Lived experiences highlight frustration with plateaus despite medication, often blaming undiagnosed insulin resistance or cortisol. A vocal minority reports success with 0.75lb weekly losses using simple resistance routines instead of gyms, while many beginners echo distrust of aggressive plans after past diet failures. Overall sentiment leans hopeful yet cautious, with frequent mentions of needing personalized thyroid labs beyond basic TSH. People managing blood pressure alongside weight loss frequently share small wins from walking programs that don't aggravate knee pain.
Cite this answer
Clark, R. (2026). M/30/6’2” [355lbs > 265lbs] (1 Year) what’s my BF%? How much more to 18% for . *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/m-30-6-2-355lbs-gt-265lbs-1-year-what-s-my-bf-how-much-more-to-18-for-those-with-hypothyroidism-or-hashimoto-s
Russell Clark, FNP-C, APRN, FNP-C, APRN
About the Author

Russell Clark, FNP-C, APRN, is the founder of CFP Weight Loss in Nashville and CFP Fit Now telehealth. Over 35 years in healthcare — Army Nurse Reserves, Level 1 trauma ER, hospitalist — he developed a 30-week protocol integrating real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 30–90 pounds. He and his wife Anne-Marie lost a combined 275 pounds using the same protocol.

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