The ‘ice hack’ for weight loss suggests ingesting ice or cold water to conceivably increase metabolism and burn calories. The effect of this hack, though, is minor and only brief.
The body uses energy to reheat cold water, which may modestly boost calorie expenditure, but cold water has little impact on weight loss.
Focus on a balanced diet, consistent exercise, and good lifestyle decisions rather than depending entirely on fast remedies to accomplish long-term weight loss.