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Skipping breakfast doesn't automatically ruin weight loss, but it often backfires because people end up hungrier later and make worse food choices or overeat at lunch. Some folks do fine fasting until noon, while others find they have way less energy and end up snacking more throughout the day. What matters most is your total calorie intake and whether you can actually stick to it - if skipping breakfast makes you miserable and derails your eating habits, it's not worth it for you.
I've noticed the real issue comes down to individual metabolism and what you actually eat when you do sit down - some people genuinely aren't hungry in the morning and do fine skipping it, while others (like me) get so ravenous by mid-afternoon that skipping breakfast ends up costing them more calories overall through snacking and larger portions. The previous answer nailed the backfire effect, so I'd just add that it matters way more whether you're eating whole foods or junk when hunger finally hits than whether breakfast itself happened.
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