What is the best option for an overweight (but generally healthy) person to lose weight, like for example 10kg within a year? Please try to give a specific suggestion.

Sonar Pro

Answer: I maintain my original position that the best option is a sustainable 500-calorie daily deficit through reduced fat intake, less overall food, and more exercise, as it is directly backed by the highest-quality evidence from a large observational study of obese adults achieving ≥10% weight loss.

The other models' arguments, while sensible and emphasizing sustainability, high protein, walking (8,000-10,000 steps), and strength training, do not provide citations to search results and rely more on general knowledge or unverified claims about NEAT, protein dosing (e.g., 1.6-2.0g/kg), or muscle preservation specifics, which are not directly supported here[1][5]. My position is grounded in [1], the most relevant and authoritative source: a nationally representative study of obese U.S. adults showing eating less fat (OR 1.37 for ≥10% loss), exercising more (OR 1.36), and eating less food were top strategies for meaningful weight loss, outperforming diet products, liquid diets, and popular diets[1]. This aligns perfectly with 10kg (~10% for many) over a year (~0.2kg/week, ~500 cal/day deficit per [4])[1][4]. Others suggest lower deficits (200-300 cal), but [4] explicitly states 500 cal/day for 1lb/week (~0.45kg, scalable to goal), and [1] confirms efficacy without needing unproven additions like precise steps or high protein, which [5] notes composition matters less than total calories/exercise[1][4][5]. Strength training is implied in 'exercising more' (55% prevalence, OR 1.36), and [8] supports 150min/week activity[1][8]. Proposals like plate methods or tracking are helpful but secondary; evidence prioritizes fat reduction and exercise over them[1][2]. No model cited stronger data to overturn [1]'s adjusted odds ratios, and sustainability claims are circular without long-term adherence metrics here[1]. Specific plan remains optimal: 1,200-1,800 cal/day (per [5]), low-fat methods/fruits/veggies/fiber, fewer processed foods, 150+min moderate exercise + strength 2x/week, track initially, water/sleep[1][2][5][6][8]. This matches sources without unsubstantiated extras.

Grok 4.20

Answer: The best option is to establish a sustainable daily calorie deficit of 300-500 calories through improved diet and regular exercise, such as tracking intake with an app while focusing on whole foods and adding 150 minutes of weekly moderate activity.

For losing 10kg over a year, which equates to roughly a 200-300 calorie daily deficit given that 1kg of body fat is approximately 7700 calories, extreme diets or intense regimens are unnecessary and often lead to rebound weight gain. A balanced approach prioritizes long-term habits over quick fixes: use a reliable tracking app to monitor portions without obsession, emphasize nutrient-dense foods like vegetables, lean proteins, and whole grains to stay full, and incorporate both cardio and strength training to preserve muscle mass and boost metabolism. This method is effective for generally healthy individuals because it addresses the root cause of weight gain (energy imbalance) while minimizing risks like nutrient deficiencies or metabolic slowdown, supported by extensive research from sources like the NIH showing gradual loss of 0.5-1kg per month yields better adherence and maintenance. After reviewing the other models, I maintained this position because their arguments are largely consistent with my original stance on a moderate calorie deficit combined with diet and exercise changes. While some like Gemini 3.1 Pro and GPT-5.4 add useful emphasis on high-protein intake and specific step counts or resistance training, these are refinements rather than fundamental shifts, and my approach already accommodates them within 'improved diet' and 'regular exercise'. No single argument was compelling enough to warrant a full change, as they reinforce sustainability without introducing superior evidence against tracking apps or the 300-500 calorie range.

GPT-5.4

Answer: I would keep my original position: the best specific option is still a modest calorie deficit built around a high-protein, minimally processed diet plus regular walking and basic strength training, targeting roughly 0.2–0.3 kg of weight loss per week.

The other models mostly reinforced rather than overturned my view. There is broad agreement across the answers on the core principles: gradual loss, a sustainable calorie deficit, regular physical activity, and some form of resistance training to preserve lean mass. That consensus increases confidence that the original recommendation was directionally right. The strongest additions from the other models were about implementation detail, not about changing the underlying answer. Several gave useful specifics such as 8,000–10,000 daily steps, 150 minutes of moderate activity per week, or using an app to track intake initially. Those are reasonable operational tools, and I would gladly incorporate them as optional tactics. But they do not amount to a fundamentally better strategy than the one I already gave. I was not persuaded by suggestions that framed the plan primarily around eating less fat or fixed calorie targets like 1,200–1,800 calories per day. For a generally healthy overweight person, rigid calorie prescriptions can be poorly individualized, and emphasizing low fat specifically is less compelling than emphasizing satiety, protein, fiber, and overall adherence. A person can lose weight on higher-fat or lower-fat patterns if calories and sustainability are handled well, so I do not think that is the best universal specific recommendation. I also think my original answer was better calibrated on food quality and hunger management. A high-protein, minimally processed pattern with structured meals is more behaviorally useful than simply saying 'eat less' or 'track calories,' because it helps people spontaneously reduce intake while preserving muscle and controlling appetite. The other models mentioned this to varying degrees, but none offered a substantially superior alternative. If I were refining my original answer after reading the others, I would make it slightly more concrete by adding a daily step target and perhaps suggesting short-term calorie tracking for calibration. For example: three protein-centered meals per day, mostly whole foods, minimal liquid calories, 8,000–10,000 steps per day, and strength training twice weekly. But that is an elaboration of my original position, not a change in it. So I did not change my mind because no competing answer presented a meaningfully stronger framework; they largely converged on the same one. The differences were mostly in packaging, degree of specificity, or a few assumptions I consider less robust.

Claude Opus 4

Answer: The best option is to create a consistent daily caloric deficit of approximately 300-500 calories through a high-protein, whole-food diet combined with daily walking (8,000-10,000 steps) and twice-weekly strength training, aiming for a steady loss of about 0.8-1kg per month.

After reviewing the other models' responses, I'm refining my position to incorporate two key improvements while maintaining the core approach I originally advocated. **What I'm updating and why:** First, I'm increasing my emphasis on strength training and protein intake. Multiple models — particularly Kimi K2.5, Gemini 3.1 Pro, and GPT-5.4 — made compelling arguments about the critical importance of resistance training for preserving lean muscle mass during a caloric deficit. My original suggestion treated strength training as almost an afterthought ('ideally, add 2 sessions per week'), when it should be a co-equal pillar of the plan. Losing weight without preserving muscle means losing metabolic capacity and ending up with a worse body composition. I now place strength training alongside walking as a core recommendation, not an optional add-on. Second, GPT-5.4 and Kimi K2.5 both made strong cases for explicitly targeting higher protein intake (roughly 1.2-2.0g per kg of goal body weight). This is a concrete, actionable recommendation that I underemphasized. Protein supports satiety and muscle preservation — both critical for sustainable fat loss. Third, I'm adopting the step-count framing (8,000-10,000 daily steps) from Gemini and GPT-5.4 rather than my original '30-45 minutes of walking' recommendation. Steps are easier to track, more flexible in how they're accumulated throughout the day, and give people a concrete daily target. **What I'm not changing:** I still believe the plate method approach to eating is superior to calorie tracking for most people starting out, though I acknowledge GPT-5.4's point that a few weeks of tracking can be educational. I still believe walking is the ideal primary cardio modality. And I still believe the modest deficit approach (not crash dieting) is the foundation of success. **Where I disagree with others:** Sonar Pro's recommendation of 1,200-1,800 calories is too prescriptive without knowing the individual's stats — for a tall, active man, 1,200 calories would be dangerously low. Grok's emphasis on tracking apps as a central tool risks creating an unhealthy relationship with food counting for some people; I prefer the plate method as a default with optional tracking. Sonar Pro's 500-calorie daily deficit is on the aggressive end for someone only needing to lose 10kg — a 300-400 calorie deficit is more appropriate and sustainable for this moderate goal. The core consensus across all models is clear and correct: modest caloric deficit + whole foods + movement + consistency = sustainable weight loss. The differences are in emphasis and specifics, not fundamental approach.

Gemini 3.1 Pro

Answer: The most practical and sustainable approach to losing 10kg in a year is to target a daily caloric deficit of 300-500 calories through a high-protein, whole-food diet, combined with strength training 2-3 times weekly and a baseline of 8,000-10,000 daily steps.

The other models provided strong, scientifically sound advice that largely corroborated my initial stance, reinforcing that the combination of a mild caloric deficit, adequate protein, strength training, and increased daily steps is the gold standard for sustainable fat loss. While GPT-5.4 and Claude Opus 4 correctly pointed out that the strict mathematical requirement to lose 10kg in a year is a daily deficit of roughly 210 to 250 calories, I maintain that targeting a 300-500 calorie deficit is the superior practical recommendation. As Kimi K2.5 astutely highlighted, aiming for a slightly higher deficit accounts for inevitable tracking errors, intermittent indulgences, and metabolic adaptation. A theoretical target of 200 calories is too easily wiped out by a single tablespoon of untracked cooking oil or a minor miscalculation. A 300-500 target provides an adequate buffer to ensure the actual real-world average falls perfectly in line with the 10kg yearly goal. Furthermore, models that suggested generalized 'moderate activity' or purely cardio-based routines (like Grok 4.20 and Sonar Pro) miss the critical distinction between weight loss and fat loss. GPT-5.4 and Kimi K2.5 correctly agreed with my emphasis on strength training to preserve lean muscle mass, which protects the resting metabolic rate and ensures the lost weight is almost entirely adipose tissue. Similarly, the specific prescription of 8,000 to 10,000 steps capitalizes on Non-Exercise Activity Thermogenesis (NEAT), which burns substantial calories predictably without spiking the hunger hormones or requiring the physical recovery associated with intense cardio. Because the consensus validates this specific synergy of a buffered nutritional deficit, muscle preservation, and low-fatigue movement, my position remains unchanged as the most effective and durable strategy.

Kimi K2.5

Answer: The best approach is to maintain a moderate daily caloric deficit of 300-500 calories through mindful eating and portion control, combined with twice-weekly resistance training and a goal of 8,000-10,000 daily steps, aiming for a gradual loss of approximately 0.2kg per week.

While the other models offered reasonable variations, none provided compelling evidence to change my specific recommendation. Claude Opus 4 and GPT-5.4 suggested smaller deficits (250-300 and 200-300 calories respectively), but given that 10kg of fat loss requires approximately 77,000 calories, the theoretical minimum deficit is only ~210 calories daily. A target of 300-500 calories provides necessary buffer against metabolic adaptation, tracking errors, and adherence gaps, ensuring the 10kg goal is actually achieved within the year rather than theoretically possible. Gemini 3.1 Pro's answer largely converged with mine, recommending nearly identical parameters (300-500 calorie deficit, 8,000-10,000 steps, strength training 2-3x weekly), which validates my approach rather than challenging it. Sonar Pro's recommendation of 1,200-1,800 calories and low-fat emphasis is potentially problematic—calorie floors risk undereating for larger individuals, and dietary fat restriction is less important than protein sufficiency for body composition. My specific combination of resistance training frequency (twice weekly is sustainable for beginners while sufficient for stimulus), step count (objective NEAT measurement), and protein prioritization (1.6-2.0g/kg) represents the optimal balance of efficacy, muscle preservation, and long-term adherence. The other arguments were variations within the same paradigm, but did not demonstrate that a smaller deficit or plate method (Claude) would reliably achieve the specific 10kg target against real-world friction.

Final Summary

The AI Roundtable unanimously rejected crash dieting, instead championing a 'slow and steady' approach of losing 0.2kg per week to ensure long-term success. While most models, led by Gemini 3.1 Pro and Kimi K2.5, emphasized a buffered 300-500 calorie deficit to account for tracking errors, Claude Opus 4 significantly revised its position mid-debate to elevate strength training and high protein from optional extras to essential pillars. Sonar Pro provided the most clinical take, advocating for a specific low-fat focus based on large-scale observational data, though the group generally preferred flexible whole-food 'plate methods' over rigid fat restriction.

All 6 models agreed