29 Hormonal Adjustments: The complex interplay of hormones regulating hunger (like ghrelin) and fullness (like leptin) can shift as the body adapts to weight loss, potentially increasing appetite or making it harder to maintain a calorie deficit
Over the past few years, a new class of injectable medications has changed the way obesity is treated
The donation process removes approximately 600-800 mL of plasma (per FDA regulations in 21 CFR 640.65), which can temporarily affect fluid balance, blood pressure, and metabolic homeostasisfactors particularly relevant for patients managing diabetes or undergoing active weight loss
Jumping straight back to a higher dose significantly increases the risk of side effects
However, under new guidance issued on 1 April 2026, it can now be prescribed on the NHS to patients with a BMI of 27 or greater who have already had a heart attack, stroke or serious circulation problem in their legs
What should I know before starting Ozempic